gmc envoy won't start
2002 cmc envoy. intermittently won't start. turn the key and everything lights
up but no ignition at all. i had the gear shift switch/sensor fixed and i thought
that was the problem which seemed to be for a while now i'm back to the
same problem. i even had it towed to my mechanic and when it arrived it fired
right up. they kept it for a week and no problems but now a couple months
later i have the same problem. they thought it could be the ignition switch but
no way of telling when it starts for them. very frustrating.. any suggestions?