I have a 2000 OBS Cadillac Escalade, it has the Vortec 5.7L V-8. In the last two months, (I've had it five) it has not turned over like the engine was seized, but fires right up if I remove the spark plugs. I literally remove the spark plugs try to start it replace the spark plugs (same ones) and it fires right up. The first time I thought the owner just hadn't serviced it in a while so I bought new plugs+wires a starter+battery and changed oil+filter, but now it has happened again less than 2,000 miles later. Anybody have any idea what could be going on? I've searched the boards and researched the passlock system, I'm at the point of not letting the wife drive it, not sure when it will not start again is something I'm not keen on leaving her with even if we have AAA. Any help would be greatly appreciated.