Try taking out your IAC motor and giving it a good cleaning. Then check your TBs for gunk as well. Hopefully that solves it, the other end of the spectrum is a bad ground somewhere which is a pain in the ass to look for. Anyways, search "idle hang" here and on the other site and you'll find tons. If U need any help shoot me a PM, im on the vca site (under the same screen name) more than here.
Make sure you use throttle body cleaner not carb / choke cleaner. The latter will screw up the seals and other things in the IAC. After it is all shiny inside, give the inside a good hosing with WD40 or equiv. Shake out the excess and install. The IAC will take some time to relearn based on my experiences with this.
My whole point was a joke since every redneck with a Camaro or Mustang would have suggested to "Seafoam" the motor. I added the effect of playing the old coin video game "Spyhunter" where you could do a smoke screen with the push of a button... Or just dump in a can of Seafoam.
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