I just replace all ignition coils and spark plugs
SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4
ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.
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.
SOURCE: 99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..
Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...
SOURCE: 2000 toyota 4runner pulling a random misfire in
try a new crankshaft sensor not hard to change 2 bolts and a wire
SOURCE: My 2001 Grand Am is randomly misfiring. Have
Has the ECM been checked, and all the igniotion connectors.
Have the fuel injectors checked you may have a bad one or two, or possibly bad gas, or a low fuel pressure problem.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
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