Question about 2003 GMC Yukon

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2003 gmc yukon wont idle

My 2003 yukon wont idle, i put a new mass air flow sencer and still i have the same problem, what could it be? the truck runs fine other than it wont idle??????? please help

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  • slingersink Jan 23, 2009

    the replaced the gas cap it is not a rough idle it just wont idle as soon as you let of the gas. do you no what it could be?

  • Anonymous Mar 21, 2014

    headlights wont come on



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I know that this will sound Stupid. Change the Fuel Cap. If the Seal on the Gas Cap is Bad it will allow Air to get into the Fuel tank and cause your Rough Idle.

Posted on Jan 23, 2009

  • Travis Humphries
    Travis Humphries Jan 23, 2009

    I usually just run a Can or two of B12 Chemtool through the Fuel System to Eat away all the Deposits. Works Great. You have already replaced Everything that could cause this. The only other thing that I can think of is Maybe the Throttle Body Gasket is Sucking Air. Maybe a Light Rebuild on the TBI Could resolve this Problem.



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Have a 2003 Gmc Yukon Xl 2500 6.0. When you first start it, the idle is low then high repeatedly. When you take off it sputters and will be ok until its warmed up. We have replaced the battery, spark...

I suspect the idle solonoid and/or the automatic choke Idle somonoid plays havoc when cold and you have to keep playing with the revs to keep it running. Even though you had cleaned the mas airflow sensor it still may be faulty. I would take it to Orielys or Autozone and ask them to read the codes for you {no charge} this will eliminate the guess work, good luck

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2 Answers

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1 Answer

I have a 2003 gmc yukon 5.3 the engine idles rough sometimes the idle will get so low the engine will shut off.(the engine runs good while driving) hooked to scaner po101 maf/vaf (dont know what vaf is),...

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1 Answer

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* Use only one foot on the gas peddle - Just teasing. :)

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