Rough Idle
#1
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#5
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Okay. I did swap the plugs with NGK 4177, fluids have been replaced and have MSD wires. I drove it to work this morning and at first the clutch was making so much noise, I couldn't tell anything else. The clutch calmed down and the car drove and ran smoother the longer I drove it. while in neutral it would rev up to around 2K then slowly fall back down to around 900 rpm. then a few backfires.. Do you think the computer is trying to re-time itself or something like that and causing the idle and backfire?
#7
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Yeah, in the beginning, I had it dyno and tuned. Later on this guy out in Arizona NickD tuned it for taller tires. At the time the IAC was shot and he tuned the car to basically not stall. I think he adjusted the idle and cracker. Then I replaced the IAC a few months later.
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#9
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Okay just fired it up and it never idled above 1K but ran very rough. like it's missing but I changed the plugs yesterday. It really sounds like half the engine is working. As it warmed up the idle started to slowly get steady, then backfire and the idle drops and stumbles for about 10-15 sec, then the cycle starts over again.