Question about 2003 GMC Yukon Denali
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
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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