hey guys, I have a 97 chevy k1500 with the gsr 400 in it that runs great most of the time. but it will randomly just shut off and will not crank up until alittle later then its fine again until it happens again. there are no error codes on computer it has new fuel filter and pump comes on at start even when it acts up took it two shops and thay cant find it when it is acting up it will sometimes crank and idle for a minute then cut off any suggestions will be helpful ty