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ChevyTech · 08-18-2022, 08:02 PM

The top link has the system running in open loop. The TPS reading is bad.

The bottom link has the IAC at zero which you never want to happen. The throttle stop screw is holding the throttle to far open. The TPS reading is bad. It is in closed loop operation.

Well at least the system voltage is good now so the alternator change was a success.

Take a look at the TPS and see if it is plugged in all the way and look to see if it cracked when you were working with it.

Back out the throttle stop screw some.

08-18-2022, 08:02 PM	#34
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: High idle on each start The top link has the system running in open loop. The TPS reading is bad. The bottom link has the IAC at zero which you never want to happen. The throttle stop screw is holding the throttle to far open. The TPS reading is bad. It is in closed loop operation. Well at least the system voltage is good now so the alternator change was a success. Take a look at the TPS and see if it is plugged in all the way and look to see if it cracked when you were working with it. Back out the throttle stop screw some. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.