You can try to make that adjustment... But keep in mind that the ECM can and will adjust to what it thinks the proper idle should be... Even if you try to turn the idle up( just an example BTW ) The cars ECM will still compensate and try to idle ats what it sees as the correct idle for the conditions met..
This is why you want to know what the ECM is seeing, and what its trying to do to correct for the problem... Simply adjusting it may end up being a never ending battle if you don't know what the real issue is...
1) Has the Throttle Body and IAC passages ever been cleaned?
2) I know that the TPS is in a Bad place, but are there any markings that show it to be a unit other Than AC Delco, Possibly wells, GP Sorenson....
You can adjust it if you want to, but make sure the adjusting screw is marked, and you know where the fractor setting is( thats if it hasn't been adjusted in the past by another)
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