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2004 Chevrolet Trailblazer Question: hesitation at highway speed



brianole, 4.2L 6 Cylinder, Mercer, PA, January 24, 2012, 12:02

I asked a friend who works on vehicals everyday and he said it was the EGR valve, but the model I have dose not have a EGR valve, what could be the cause, I do have a check engine light on. This only happens at Highway speed, when the trailblazer has made it's final shift, and we are cruzing. Just want to know a little before I get the run around at the shop!

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