Re: Vibration on Hummer
It could be several things. Poor fuel/other if the vehicle was laying around for a while or if contaminated in some way. Sounds to early to have any valve issue...
You should call your dealer and explain the conditions relating to the problem. Whether happening at idle or at traffic lights. Cold or warm engine and other data...
Bring it in for analysis. Its under warrentee.
Good Luck! 
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