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Discussion Starter · #1 ·
2002 XL Denali hesatatesafter being shut down for 1/2 hour then start driving & it is terrible for awhile
 
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Discussion Starter · #3 ·
Maybe a valve is or two are not functioning properly, or you're using cheap/watered down gas.
 
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Discussion Starter · #4 ·
Did we go 4 wheeling and beat on it a little to much this weekend?

Your timing could be off.

But sounds like a major tune up could also be a easy fix.
Pull some plugs and see what you got.
 
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