I have a 1998 chevy 1500 5.7 4wd and it just shut off and I lost everything no power windows or locks no radio no head lights or brake lights so I checked for loose wires and bad relays after that I did the security relearn and it started up I got home went to leave a little while after that did the same thing it started and rolled about 20 feet and shut off again so I replaced the ignition switch and the key lock did the relearn it started up 4 times went to leave it rolled 20 feet and shut off again any ideas as to what to do next?