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My 2002 GMC Yukon Denali "lopes" on start up only. I can start driving it immediately and it doesn't do it anymore, not does it do it after I get going. Only at start up "sometimes". Otherwise truck runs like a top. Any suggestions? Thanks,


   
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Some common cuases for this problem are a fuel pressure regulator leaking. This causes a rich condition and will cause this problem until it gets cleared out by driving or reving it up a few times.
Also the lower intake manifold gaskets leak vacuum and will cause idle problems until the engine warms up and the gaskets seal better.


   
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