Jerry, you just saved me a bunch of money!
ive been having a rough idle problem; it would idle smoothly for a couple seconds, but then it will stumble. the tachometer would drop when it stumbled, then it would recover and idle smoothly again for a short time.
i cleaned my throttle body with cleaner spray... it didnt help, but it sure looks shiny now.
i read this and thought cleaning my IAC might help, so i pulled it out and it was dirty as sin. cleaned it thoroughly (and the housing) and reinstalled it, but the rough idle still persisted. i was fed up and considering taking it to a real mechanic...
but i got back on here and read through a couple more threads until i found your reply on this thread
. i sprayed cleaner into the IAC housing while idling, and it cured my rough idle problem. thanks a bunch!
here is what my IAC looked like before i cleaned it: