last week my GMC jimmy froze up. I got it unfroze and now it runs for a lil bit and then dies .and after it dies u cant get it to start agine, u can here the full pump kick on when u turn the key but no start?????
Meaning you had water in the cooling system that froze to ice? That might be the end of your 4.3L if you let it freeze and cracked the block. See if the freeze plugs popped out.