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Finding leaks in the evaporative control system requires special equipment. It takes only a small hole somewhere to cause this to occur, and it could be a bad sensor or wiring as well, so it's best to have a professional look at this. Here are some in your area: http://repairpal.com/hummer-repair-in-akron-ohio I suggest going to a shop that regularly addresses these types of problems, or performs emissions testing.

As stupid as it sounds ...touch negative and positive cables together and reinstall , make sure you have a good connection when you reconnect , then sell the piece of crap !!!!!!