Thread: 98 GMC TPI 5.7-350- 1500 series TPS or IAC problem.
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Old 06-15-2007, 11:35 PM
2000CAYukon 2000CAYukon is offline
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Re: 98 GMC TPI 5.7-350- 1500 series TPS or IAC problem.
I would unplug the IAC and see if the problem goes away. With the IAC unpluged, the PCM will not be able to change the idle speed. If it still does it with the IAC disconnected, it could be TPS or even a vacuum leak. Getting it hooked upto a scan tool will help determine the fault.

//2000CAYukon
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