Question about 2003 GMC Yukon Denali

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Truck Stalls when ideling in traffic

When driving the truck runs fine but when in traffic or at a red light my truck sputters and feels like its going to cut out. If I place the truck in neutral or in park it won't cut out. have anyone experience this?
Oh - this started happening when I filled up my tank and then added a bottle of STP gas cleaner to my tank

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  • Anonymous Jan 18, 2009

    I'm having the exact same problem. Runs kindof choppy when driving (spits & sputters some), but when I stop at a light or drive thru, etc, it bogs down, then dies. If I put it in neutral or park, it doesn't die, just if it's in drive. Mine has nothing to do with fuel, I don't believe. I put medium & high octane Exxon Mobil in mine and always have and haven't always had the problem. Any suggestions, I'd love to have some !!

  • Anonymous May 07, 2009

    i have same exact problem on my 2003 yukon denali, it sputters every time i reverse and hit brake, they told me it might be mass air flow sensor but i find it hard to believe.

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I don't know what the STP cleaner may have done; I had a similar problem where my car would idle very low when stopped or in a drive-through waiting. It turns out there was black soot on the engine intake. I disconnected the rubber hose from the air filter at the engine (take cover off, loosen 1 clamp). I used a spray can of throttle body cleaner and wiped the area clear. I then had my dealer perform the programming change for a service bulletin that mentions throttle body coking.

Posted on Dec 31, 2008

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