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Manually holding the throttle valve open farther with a stop screw doesnt seem temporary to me?
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thats what i thought too, until i tried it. I set it at 900 one night, went for a drive and it was still at 900 at every stop i made. Then the next morning when i started it back up, it was down to 700.
Its either the TPS or the IAC (or both) that compensates when you set the idle manually and then it sends it back down.
Mr 5 0, I think i've read a post in where you explain the proper way to set the idle. Dont you have to set it with a feeler gage to factory specs, then unplug the IAC while you turn the screw, or something like that?