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Re: Upper Plenum replacement 3800 series II - post install problems
You could try an idle relearn. Disconnect battery negative cable for several minutes, then reconnect. Take ignition to on for at least 5 minutes and then off for 10 minutes. Start engine.
Another possibility is maybe some carbon got dislodged inside the throttle body (TB) when doing the UIM job. Remove and clean the IAC with carb or throttle body cleaner. Do the same with the IAC seat on the TB and the TB bore. Also, make sure all vacuum lines are tight and connected in the right locations. I hope the UIM and TB were torqued to specs.
Welcome to AF.
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