Question about 1997 Pontiac Grand Prix

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I have a 97 pontiac gp i had it scanned to see why my service engine soon light was on it came back that cylinder 5 was misfiring i changed the coil pack,plugs,and wires but it still say cylinder 5 misfire and also when it sit still it sound rough but it stalls a little bit wheni get on the gas but it soons takes off right after that can you please help with solving this problem

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Replace your #5 cylinder fuel injector. You rough idle sounds like low, or no fuel to the cylinder. Your hesitation on accelleration says the same.. A new fuel injector should resolve your issue.

I hope this helps you, and I wish you luck on your repair.

Posted on May 10, 2009

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Possible causes
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The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
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When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

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