2004 H2 running rough??? - Hummer Forums by Elcova

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2004 H2 running rough???

08-20-2010, 04:32 AM

ohiost8te

Hummer Novice

Join Date: Nov 2009

Posts: 19

2004 H2 running rough???

I have a 2004 H2 that has started running rough at higher speeds....it feels like it is missing or something. It hasn't pulled a code, so I don't think it is the O2 sensor...any ideas of what it may be? Spark plug? I am hoping to figure it out before it gets worse....

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