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Originally Posted by essikr
Thanks for the quick reply, I checked the plugs they are Delco 41-940 .The wires are new but they are not Delco.
I reved the engine in park and at 4000 rpm it misses,I tried disconnecting the maf sensor ( at least I think it was it? ) and reved the engine and it still missed at around 4000 rpm.Which one is the maf sensor?
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The best plugs to use are the AC Delco 41-101 Iridium. If the 41-940 are double platinum they could cause problems. The other AC Delco plug that works is the Rapidfire #14 Platinums. The wires recommended are the AC Delco Premium Silicone 7mm.
The MAF sensor is the square black module located on the top of the throttle body. The PCM has a rev-limiter that kicks in at around 4000 rpms so it will be normal for the cutoff in park or neutral. Try testing on the road with MAF disconnected. If that doesn't work then wires and plugs are the most likely cause.