Miss firing on multiple cylinders, is what computer test says, changed spark plugs, wires, and a coil cause the middle one (5,2) wasn't firing after all that still miss fire. What else could it be??


Asked by Feb 17, 2015 at 10:30 PM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

3 Answers


The other 2 coil packs. Are the plugs gapped properly? Are the plug wires seated to the coil and spark plugs fully?

1 out of 1 people think this is helpful.
Shawn Pulliam

plugs not hot enough or not original plugs burning up coils


If one of the coil packs failed, the others may be weak. HTH. -Jim

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