WHY IS MY IDLING HIGH WHEN I COME TO A STOP?

2000 GMC Sierra

Tiny

tylercovell

September, 8, 2012 AT 2:19 AM

I have a 2000 GMC Sierra 1500 5.3 and I recently changed the IAC and the TPS and cleaned the egr and maf sensors and it fixed the problem of rough idling and sputtering. Now after doing all of that sensor work it now feels like the throttle gets stuck when I slow down and come to a complete stop. When I'm at a stop the truck sits at roughly 1200 rpms for at least five seconds and then it will go back to the normal idle. Why would it be doing that?

13 Answers

Tiny

saturntech9

September, 8, 2012 AT 3:46 AM

Have you checked for codes yet?

Tiny

tylercovell

September, 8, 2012 AT 12:51 PM

Well it's not throwing any codes at all.

Tiny

saturntech9

September, 8, 2012 AT 3:07 PM

Lets try this remove the negative battery cable for one min then hook it back up. See if that works sometimes all you have to do is give the computer a little reboot like when your cell phone acts up and you turn it off and on again. Let me know what happens.

Tiny

tylercovell

September, 9, 2012 AT 1:23 AM

Ok so I tried that and nothin changed. Now I was thinking, I did clean the throttle body and replaced the gasket, could a vacuum leak from the new gasket not sealing properly possible cause it to act that way?

Tiny

saturntech9

September, 9, 2012 AT 2:35 AM

The only reason I wasn't thinking a vacuum leak was because it idles down after a few seconds. It wouldn't hurt to look for a vacuum leak. Also. How is the coolant temp sensor?

Tiny

tylercovell

September, 9, 2012 AT 4:13 AM

I changed that about 6 months ago and alright I'll check and get back with you

Tiny

saturntech9

September, 9, 2012 AT 5:25 AM

Alright keep me posted.

Tiny

tylercovell

September, 13, 2012 AT 7:48 PM

So I have been driving the truck and it still does it but I notice it only does it with the ac on.

Tiny

saturntech9

September, 13, 2012 AT 8:43 PM

Does the idle kick up when turning on the ac?

Tiny

tylercovell

September, 13, 2012 AT 9:43 PM

When the truck is sitting still at idle and I turn on the ac it fluctuates every so often like every 45 seconds it's will rev a up from like 600 rpms to about 700 to 750 and drop back to 550-600

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