Rough Idle at lights and stop signs

Asked by debihop59 Feb 06, 2017 at 07:59 PM about the 2000 GMC Sierra 1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

I replaced my 2000 GMC Sierra 1500 (V8) TPS sensor because of rough idle, did not solve the problem, so I replaced  the Idle Air Control Valve, and that didn't fix it either.  I have tried resetting the ECM and it runs fine for a few minutes, but then it's back to running rough again at low idle.  I also thoroughly cleaned the throttle body.  Any tips or suggestions on how to get it to keep and accept the reset?

2 Answers
223,755

Rowefast answered 7 years ago

Clean or replace the Mass Air Flow Sensor. There is a special cleaner to use for cleaning this.

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Rybcklw420 answered 6 years ago

Just fixed my 17, all I did was spray throttle body cleaner into the throttle body after cleaning very well and the low idle came right back up after a few high revs to w.o.t. ( wide open throttle) and is running like new again so I will do this every LOF , and jus cleaning the throttle body is not enough, you need to spray it to clean the sensors and upper plenum.

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