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Just had my spark plugs and wires replaced on my grand am 2004 6 cylinder. Now it is spuddering when I drive it and moves like it wants to go when I am at a stop. But it doesn't do it when I am in park.

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Check the wires and make sure they were put back in the right place

Posted on Oct 13, 2013

  • Kathryn Thomas Oct 13, 2013

    Replaced them one at a time so there would not be a mix up in the process. Any other ideas?


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Posted on Jan 02, 2017

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SOURCE: 2004 pontiac grand am misfire

Check the plug wires for those 2 cylinders, next check the injectors, as they can cause misfire when defective.

Posted on Mar 19, 2009

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SOURCE: 2001 grand am se1. Rough Idle - Spark Plugs and Spark Plug wires

What engine? You need to have it scanned for codes. Autozone will do this for free

Posted on Sep 01, 2009

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SOURCE: 1999 pontiac grand am 4 cylinder rough idle, rpms fluxuates

Most likely your throttle position sensor is faulty. You could have a vacuum leak as well. Most probable cause is a bad sensor. Is your check engine light on? Have you checked your engine codes? You can go to and register for full free online repair manual.

Posted on Sep 14, 2009

Testimonial: "the check engine light had been on but we unplugged the battery yesterday for a couple of hours and put it back in and the light isn't on anymore. "

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SOURCE: My 2004 jeep grand cherokee pulses! But only when

Have the idle mixture motor replaced and clean the throttle body intake, throttle plate, and that throttle linkage you see on the side of the throttle body with throttle body cleaner. Also, dump some complete fuel system cleaner in your gas tank and fill it with premium for a change, you cheap bastard.

Posted on May 18, 2010

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Miss fire at cylinder 6 on my 2004 grand am 3.4 i have replaced new plug new coil and wire whats next still miss fires

With the engine running and the cylinder misfiring tap (key word is tap) the injector with a screwdriver a couple of times. If the misfire goes away replace the injector.

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My girlfriend has a 99 pontiac grand am with the 2.4 l an has a cylinder number 2 misfire .. it spits an spudders out exhaust any ideas where to start ?

Plugs, a coil tower, and four spark plug boots would be a good start. Wery common for the towers to go bad on these.

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VW Golf 4 2.0 highline. Car takes time to start up and when it eventully does, grey smoke comes out that smells like petrol. When driving, car loses power and it makes a sound like a diesel car.

You more than likely have a bad coil pack, wire, or plug. Check each spark plug (its a 5/8" Spark Plug Socket), make sure they all look OK. The bad one should be completely black, if it really is fuel. If they all look the same, try pulling each spark plug wire off one at a time, putting it back on if you find it makes a big difference in how the car idles. Once you find one that doesn't affect the idle, you found your culprit. Try swapping with another cylinder and see if the problem moves cylinders. If it stays on the original cylinder, the problem is likely your coil pack. If it moves cylinders, you need new spark plug wires. Always replace the spark plugs when you replace the wires as well.

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Kinda putters then engine light came on and its giving me a code p0303

p0303 is a mutible engine misfire on number 3 cylinder. the best fix,

A code P0303 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
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2004 jeep grand cherokee 85,000 miles. code p303 (cylinder 3 misfire, right?) just had spark plugs replaced to try to solve problem - didn't work. check engine light blinking, car shudders, even worse...

Just had a very similar problem. The cause: wiring harness scrapes against the vibrating engine and wears the insulation off the wires causing shorts. In my case, this happened at the point where the wiring harness goes around the back side of the valve cover. There are some studs there that love to eat away at the wiring harness. This causes the computer to go spastic.

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2004 pontiac grand am misfire

Check the plug wires for those 2 cylinders, next check the injectors, as they can cause misfire when defective.

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di you change the spark wires? is there a change you changed wires and with that you changes the spark sequence?, if so swap the wires from those cyl.
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Changing the plugs

The plugs are in the cylinder head, there are thick wires going to them with a long rubber boot on the cylinder head end, carefully pull the plug boots off, if you damage them you must replace them, under them is a spark plug, you will need the proper tools, 3/8" drive plug socket, a few different length 3/8" drive extensions and a 3/8" drive ratchet wrench.

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