2000 Malibu, 3.1 won't start after being run for a while, if I leave it sit for a longer time it has always started. It has never shut off while driving. Had codes read came up oil preasure sensor replaced it, and the fuel preasure was at it's low side so replaced it also.. Any ideas from anyone?? Thanks

If it has trouble starting after driving but never dies WHILE driving you could have starter issues. Sometimes the starter get too hot and needs time to cool down before it can fire the car back up. Hope this helps.