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Recently a problem has risen and I'm not sure what it is. When I start my car it idles at 2k for a few seconds then drops to normal rpm (1k). But when I drive, I can be cruising at any speed in any gear and I like to throw it in neutral to coast and save gas but in neutral it will rev at 2k until I come to a complete stop or go under about 1-2 mph, then it kind of backfires and drops down to 1k. Also, when I am stopped and I rev it even a little (even if its only to 1500), the RPM goes to 2k for a second or two, backfires (a small pop from the exhaust) then drops to normal. I cleaned out the IAT, IAC, and MAF sensors already and it didn't fix it. This has only started happening recently, months after any mods were put on and it ran fine before. Plus I think its running a little rich too, I can smell it.
Thanks

Mods:
3.8TB and ported intake mani
Intake
removed muffler and replaced with straight pipe (best sound in the world :p )
 

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white95escort said:
I can be cruising at any speed in any gear and I like to throw it in neutral to coast and save gas but in neutral it will rev at 2k until I come to a complete stop or go under about 1-2 mph, then it kind of backfires and drops down to 1k.
My 97 has done that for years and I have no idea why.
 

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could it also be the throttle position sensor,being that the tb was replaced? i remember having some weird idle issues when the tps went on another vehicle.
 

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Yup, try a NEW IAC, cleaning them doesn't always solve the issue.
 
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