car will die, will start right back up,put in gear act like it can't get any gas

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This only happens when the weather is hot and has been running for a while. NEVER in cold weather. I was on the hwy for about an hour when it started stalling like it could not get any gas(the take was full) It will start right back up put in gear it will start chugging not over 20mph. let the car cool off and it will run good until it gets hot again