Another problem I ran into was that with an aftermarket filter kit, the cooling fan can blow into the intake area around and into the filter causing an erratic idle. I moved it further forward and out of the fans airflow and it cured my problem. The ISC can be a problem too, but the filter should have a shield around it if it is just stuck on the end or the AFM like mine is.
Good luck and let us know how it goes.
Russ
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