My son came home late last night and he thought he'd shut off his car while still coasting, . He had it in nuetral.. Now it wont start. It cranks great but won't turn over. Any idea why? Did he blow something up? I was thinking a vapor lock or something but have no idea. We have not tried it yet this morning. We live close to other neighbors so didn't want to crank on it too hard at 2am. Thought I'd ask before we give it a go