Question about 2003 GMC Yukon Denali

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2004 GMC Yunkon Denali is misfiring

Our Denali is misfiring. We have taken it to 2 mechanics and they cannot find the problem can anyone help?

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  • jefhow Dec 16, 2008

    This is helpful information. Mechanic is flushing transmission fluide and replacing with new fluid and running service bulletin updates on computer. We'll see what happens now.

  • TripleTauto
    TripleTauto May 11, 2010

    is it setting codes? have you recently had any work done on it?when does it misfire ? all the time?

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It could be alot of things...you could start by routine maintnence( new spark plugs, spark plug wires, air filter, oil change, the in line fuel filter) also take into consideration what kind of gas you are using...i know it sucks spending $100 a week in gas with your AWD 6.0 liter V-8...but if ur not running premium it could very well be your problem. I have also heard of the denali's having oxygen sensor issues...is it throwing a check engine code?

Posted on Dec 16, 2008

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What are wheel sensors 2004 denali

Posted on Mar 15, 2010

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Posted on Jan 02, 2017

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did he replace the fuel filter at the same time, try that first , and be sure your timing is set correctly and that your plugs are getting good spark

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