Question about 1996 Chevrolet K1500

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1996 Chevy 1500 misfire

I have a 1996 Chevy 1500 with a 5.7ltr that is running rough. It keeps throwing a code of P0300. I have replaced the following: rotor cap, wires & plugs. After all of this it still has the same issues. Any help would be great.

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  • drconley72 Feb 09, 2009

    The compression is 175 psi. It has been doing it awhile. I checked the converter, it's fine. The code means that it has multiple misfires. There are 135,000 miles on it.

  • drconley72 Feb 10, 2009

    I sprayed some brake clean around the intake by the distributor and it cought on fire. I did get the fire put out before any damage was done. That is why i put the wire & the cap on it. To get away from the shorts. But it still runs fast and misfires. It runs like that all the time. I am thinking that it has a vac. leak around the distributor somewhere but i can't find it.

  • drconley72 Feb 10, 2009

    I will try that, I will let you know if that works. Thanks!!

  • deisert Feb 14, 2009

    Mine misses under what I would consider normal acceleration. If I accelerate lightly It's OK. It also acts fine under heavier acceleration..

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I just had the same exact problem I changed the same things lso changed the ign.control mod. but it still had tto chevrolet. it was my #6 fuel injector they changed it now it runs like a champ hope this helps.

Posted on Nov 15, 2012

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Run rough all the time? or just at idle,or under load? take a fuel sample sounds like you may have some bad gas

Posted on Feb 09, 2009

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You could have a burnt valve, do a compression chk. Do you know what the code means? How many mi. on truck? Did this just come on or has it been doing this for a while?

Posted on Feb 09, 2009

  • ccn7 Feb 09, 2009

    You might want to chk. around distributor maybe a wire shorting out or ignition madual going bad, or a ground wire might of broke. grounds are critical on computered cars and trucks. Have you ever had it running at night and open hood to see if you can see any spark jumping around. When you say the code means multiple miss. fires sounds to me that something is shorting out.

  • ccn7 Feb 10, 2009

    I did not know it was running fast, sense you did not mention that, now i get it, vacume leak, I know that the base gasget under throuttle body go to heck from the heat cycles and you get a vacume leak from there, but also from intake but thats usely associated with a coolant leak, because they mated aluminum to cast iron and it eats into the gasget and the aluminum intake creating a coolant leak and vacume leak. Chg. intake gasgets and the base gasget on throuttle body and it should fix it.

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Technical description:--
Random/Multiple Cylinder Misfire Detected:---
Exactly what does this code means:--
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If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the vehicle, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
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Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

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