The problem sounds very familair to me, never in the Hummer, but happened in other cars, including brand new MB and Jaguars. In the Jaguar's case, it was a Emmision chip recall I never took it in; in other cars, the cause ranges from A to Z. 3 times in brand new Benz S500 going on freeway at 65-75 MPH, they never told me what it was, they did not know and took 3 tries. Could be anything.
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