94 blazer 4.3 , runs good, shut off and wont restart. Unhook battery for little bit and restart maybe?
of course you should make sure your battery is healthy, fully charged and have it load tested, but if this is a chronic problem it could be an injector problem. had this happen on a 3.1 once. you could drive it all day, but as soon as you shut it off you had to wait an hour or so to go again. turned out to be bad injector. they can be tested.