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Make sure your cooling fan is coming on ,if you force the ac on that should make the fan come on after a minute or so if the fan comes on with the ac the problem is either the coolant sensor or the fan motor is going bad
have you disconected or changed the battery lately- the idle needs to be reset.
my 89 regal had to be started cold -put in drive with your foot on the brake - then wait untill radiator fan turns on (open the hood first to be able to hear the electric fan kick on :)
this somehow set the warm idle speed and the problem was gone :)
No spark issue can be from a number of causes. Most likely the crankshaft position sensor. It is sensitive to minor damages. check position of the teeth. If bent carefully straighten. Also can be the ECM (main computer) On cars with no fuel pressure check oil sending unit because a faulty one that tells no oil pressure will make computer cut out fuel pump operation.
Assuming it will start again once it is warmed up, it is likely the battery is in poor condition/will not hold a charge. Unhook the battery once the car is running; if it continues to run, your charging system is probably OK, and the problem is likely to be the battery. If the problem continues after replacing the battery, you probably have a slow drain or short somewhere in the wiring harness. Best of luck on that one.