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most commonly found problem relates to an electronic component heating up and shutting down. Have you checked to confirm there is fuel pressure when the vehicle shuts off. Is the check engine light on. Have you checked codes ? I suggest hooking up a fuel pressure gauge and letting vehicle run till it shuts off while monitoring the fuel pressure. If you loose fuel pressure, next step is to confirm there power going to the pump, if there is power going to the pump with no fuel pressure replace pump. Another suggestion would be to check for spark when vehicle stops running to eliminate an ignition problem. good luck
It would seem to be a fuse or fusible link problem. Check the wiring diagram in the shop manual for the vehicle and check the fusible link that is common to headlight and fuel pump power supply and the other systems which are not working. If the fusible link checks okay check the main multipoint connector in the main wiring harness to the fuse block from the battery.
From a safety point of view, I would NOT recommend it. Even though you may save a bit of fuel, the vehicle has a lot of power accessories that would leave you with dangerous problems if the engine were to decide to stop. Things like power steering and power brakes become almost impossible to work effectively.
It sounds like your CTS isn't working. The CTS works like a choke to provide more fuel to the vehicle in open loop. When it warms up, the resistance rises and lets the computer see that and the computer backs the injectors off and then you go into close loop where the 0 2 starts talking to the computer about your mixture.
I HAVE PERSONALLY CHANGED A FEW THROTTLE POSITON SENSORS IN THESE VEHICLES. BUT BEFORE YOU DO THAT, TRY SPRAYING SOME CARB AND CHOKE SPRAY IN THE THROTTLE BODY WHILE THE CAR IS RUNNING. YOU MAY HAVE TO HOLD IT AT A HIGH IDLE SO IT DOESN'T DIE ON YOU. THIS SHOULD HELP TO REMOVE THE CARBON IN THE THROTTLE BODY. IF IT STILL WANTS TO CHOKE, THEN CHANGE THE T.P.S. HOPE THIS HELPS. PLEASE KEEP ME POSTED. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA. GOOD LUCK