my 2500 Chevy express van shuts off when I stop then starts again then repeats shutting off again and then starts agian. this happened on a very hot day.though It's not over heating.
Check the codes, you could have a ECT, or ACT that is misreading, possibly even an ISC in failure, hopefully there will be a code, if not then you will need to have the system live data scanned to locate the offending component. HTH
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