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From time to time on hot days my GMC dies when it is warmed up and is not accelerating. From time to time it also dies when coasting on a bumpy road. When I pull over and hit the starter it fires right up.

clean the throttle and idle air bypass… assuming its not carbureted, that is.

Your GMC WHAT??? Many, many, vehicles wear that tag…Now, moving along, what model year is it? Also helpful would be knowing how many miles have accumulated on it…

Thank you!! I appreciate I ideas. We will go to cleaning.