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Re: High Idle, Delayed Shifting - 03 Buick Lesabre 3.8L
Another possibility is a gummed up throttle bore and plate....when released, it could stick in a partially open position, creating a higher idle.....which may cause a tps code....
Could also be a bad IAC, if no vac leaks.....or it could be the connection in the harness to the IAC, if they have too much play, causing an intermittent connection.......or it could be a bad wire in the harness to the IAC that when flexed, could cause a problem.....may have to check the 3 circuits all the way back to the PCM(mice have been known for building nests in the air box where the PCM is, and eating the insulation off the wires)......
As for the P0420, that is a separate problem....this is usually a catalytic converter problem.....
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