Question about 1999 GMC Yukon Denali

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1999 GMC Yukon seems to backfire once in a while

1999 GMC Yukon seems to "backfire" about once a week. Afterward, it will start rough, then run fine after a few seconds. Rest of the time it runs fine too. Why does it backfire?

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Look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng

Posted on Jun 27, 2009

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its the fuel pump, i have 2001 GMC yukon and thats what it did, it would start an run, idle just fine, but put it on ther computer to test it, it showed lean on both banks,meaning that the fuel pump was going out, was loosing pressure, i got a pump for 256.00 had a frind help me change it, it runs just fine,,

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