2006 gmc envoy loses power and stalls out

SOURCE: Code P0121 on 2006 GMC

Classic signs of idle air control not able to cope with sudden engine loads. Cleaning should resolve this. Remove ducting from air cleaner to throttle entrance. Spray with carb. choke cleaner or WD40 spray and wipe back to the alloy finish. clean the the throttle plate and push the throttle open with your fingers and clean in behind as best you can. Clean the passageways to the idle air control valve. Remove the valve and give it a thorough clean up. Reassemble and it should all be good.

SOURCE: Service Engine light on, car

Service Engine light on, car feels likes it's going to stall when stopped, and feels like it's vibrating. 2002 GMC yucon denali

SOURCE: Problems with stalling and high idle

I had problems with the idle and with the car stalling and found that it was a failed oxygen sensor. I replaced it and the car runs great now.

Shannon Currie

• 178 Answers
• Posted on Dec 21, 2009

SOURCE: 2006 GMC Envoy Engine light comes on in cold

Had the same prob. Mine was the O2 sensors..... I replaced Both and [knock on wood] have had no more probs.......

Harvey N Tawatao

• 3854 Answers
• Posted on Apr 13, 2010

SOURCE: 2006 Envoy stalling when idels and won't stay running

Clean your Throttle body and pay attention to the Idle Air Control (IAC) valve passageway to try to clean the IAC. A dirty or faulty IAC will cause your engine to stall at idle, the job of the IAC is to open the passage way through the throttle body to regulate the amount of air to enter the engine to keep it from stalling when the Envoy is at idle.

Start with the simple and clean the throttle body and inspect any loose or damaged wire leads to the throttle body. Replace or repair any signs of damage.

Thank you for using Fixya and good luck.