Question about 1998 Chevrolet K1500

1 Answer

2003 Chevrolet K1500 4x4 multiple miss fire code P0300

2003 Chevrolet K1500 4x4 106,000 miles, multiple miss fire code P0300, Code only appeared after the spark plugs and wires were replaced?? Was only performing basic maintenance. the truck ran fine before this. All connections are good and secure, replacing plugs and wires is usually pretty straight forward. Now Idles rough, starts sluggish, seems to run fine at higher rpm's but Fuel mileage has greatly decreased. Any help or idea's would be greatly appreciated.

Posted by on

  • 2 more comments 
  • digdugunderg Dec 16, 2008

    Yes its the 305 V8 5.3L It has individual coil packs over each cylinder and the wires are all the same length about 11 inches long and they are only long enough to fit from the coil pack directly over the corresponding plug. And I removed all plugs to double check for cracks and closed gaps, everything was good, I did use die electric grease, but that has never been a problem before. Plugs used were , AC delco none iridium's came out of the truck, AC delco iridium's were used to replace them could that be an issue I wouldn't think so but I am grasping at straws here.

  • Anonymous Mar 22, 2014

    backfires pretty consistently at idle. revs up ok and is sluggish at lower rpm speeds

  • Anonymous Mar 26, 2014

    code 301 compression good, firing at plug ,just restarted after having heads reworked And it is missing on 1 cyl.

  • Anonymous Mar 27, 2014

    also is standard trans. starts fine runs for about 20 minunites dies will nor restart for about two hours than dies again checked for codes none present but 12 code and it repeats continuely until key is turned off and help would be appricated thanks



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

IS IT POSSIBLE YOU GOT A WIRE CROSSED? or a plug is cracked and or gap closed up? i would check these. you have the 5.3? what kind of plugs are you running?

Posted on Dec 16, 2008

  • TripleTauto
    TripleTauto Dec 17, 2008

    yes kinda hard to cross those wires. those are good plugs to use. check your injectors use a long screwdriver and put tip on each injector and at your ear. you should hear each one clicking. this will rule those out. do can also try unplugging coils while running and see if you see one that does not change the engine running and this will be your cad cylinder



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2003 Buick 3800 engine 82,000 actual miles on it multiple/random misfire code How it started.. Car was running fine. Check engine light started flashing and engine started missing. What...

You can't rule anything out yet. It could be a plug or injector among other things, but probably not low fuel pressure. If you have a code 300 and nothing else, you may have to wait until the problem gets bad enough to set additional codes. And if any of the sensors fail, such as the cam or crank sensors, you'll get a code for those to be tested.
Have the plugs been checked or replaced in the past 30,000 miles ?

Mar 12, 2014 | 2003 Buick LeSabre

1 Answer

2006 jeep liberty once I hit second gear it vibrates

multiple code issue (evaporative, catalyst efficiency, and miss fire)doubtfull all 1 source of error but draw attention to the miss fire code PO300 is a random cylinder miss fire, possible crank position or cam position sensors.but i would check timing first.

Mar 25, 2013 | 2006 Jeep Liberty

1 Answer


Is the check engine light on? An OBD II code P0300 - Random/Multiple Cylinder Misfire Detected could indicate a bad crank position sensor causing a misfire. Another possibilty would be the coil or distributor cap. The 95 and 96 were notorious for burning distributor caps. My 96 used to burn one once a month which is why Chevrolet stopped using them and went to multiple coils. More information would be helpful in diagnosing the problem

Feb 17, 2013 | Chevrolet 1500 Cars & Trucks

2 Answers

I have a 2002 chevrolet blazer with a 4.3, 4dr, 4wd. Service engine soon light came on, took it to the auto part store to code it they said knock sensor, 02 sensor, low evap voltage or something close to...

No I don't think so, knock sensor only work under engine load, when sensor picks up a ping or knocking, it will adjust timing, o2 sensor could be bad, and will save you fuel mileage, but a miss will also give you an o2 sensor code, running rich, have him check for cylinder miss first.

Aug 13, 2010 | Chevrolet Blazer Cars & Trucks

1 Answer

Service engine soon code 3rd. cyclinder miss

sorry but,,if u have a miss fire in #3 ,,that's coil or wire or plug or injector,,,dont know y they replaced the battery or alt unless they were bad??? hope it helps

May 24, 2010 | 2003 Lincoln LS

2 Answers

Engine misfire code multiple cylinders, starts

The first thing to check is the fuel pressure regulator. It is a round device on the fuel rail with a vaccuum line on it. With the motor running pull the vac line and see if fule comes out, it should not. Map sensors can cause this but will almost always set a code. If I can help let me know. Good Luck

Jun 22, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

2000 Impala LS, 3800 engine has been 'missing' (intermittently losing acceleration in quick succession) when temp is at or over half way to 'hot' on temp gauge. That's usually after about 30 minutes on...

you sure its missing and not a torque converter shudder . as a auto tech some times its hard for me to tell the difference. it it was missing it would throw a miss fire code not a torque converter code at 126 k sounds the the trans needs to come out and a good tech needs to rebuild it

Jun 12, 2009 | 2000 Chevrolet Impala

1 Answer

Multiple random miss fire

Now change the distributor. Get one from salvage or e-bay. Did the timing belt jumped a tooth or is it new. Vitally

May 12, 2009 | 2000 Chevrolet Impala

Not finding what you are looking for?
1998 Chevrolet K1500 Logo

Related Topics:

494 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

81285 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides