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04 Sierra 5.3 Idling Issue

 
Jimmydean771
New User
Posts: 6
Joined: 04/13
Posted: 06/06/13 04:48 AM

I have a 2004 Sierra with the 5.3l V8 in it, and it's started not idling. It doesn't idle when I start it up, and then it will idle occasionally. It idles at about 400 RPM, but usually I have to hold my foot on the gas a little to keep it running. Besides this, the truck runs fine and runs strong. I was thinking it was a throttle positioning sensor? I read on some other forums with people having similar problems they checked the mass airflow sensor. I wanna be certain before I replace a part, I don't wanna just throw money at it. Anybody have some advice?  

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