2008 GMC Envoy won't start up sometimes

peppergirl

my 2008 envoy wont start up sometimes,when I turn the key all lights work but no start up the shifter wont come out of park.if I keep turning the key back and forth for a while it will start right up and it has stalled on me while drivibg it a couple of times,we replaced the ignition and purge valve and we didn't have this problem for about 4 months now the problems are back.it never has left me stranded all I have to do is keep turning the key back and forth and eventully it will start

tammyrln

TRY PUTTING SOME "HEET" IN YOUR GAS TANK. IF YOU HAVE MOISTURE OR WATER IN THERE,. THAT WILL CAUSE YOUR PROBLEM. HEET WILL FIX ISSUE IF THERE IS MOISTURE IN LINES