1988 grand prix 2.8 car died would not start, replaced crank sensor and it was good for 6months, now car started to die randomly once it got warm and would not restart for 10-15 min then it would start again, the weird thing about this is when it dies and you turn the key forwards the cel DOES NOT COME ON, you wait the 15 or so min and turn the key on the and the cel is back the car will start, so we changed the crank sensor again, worked for 2 days not sure if it was fluke or not but once again the car is doing the same thing when it dies the cel will not come on with ignition for 10-15 min then as soon as it comes back the car will start, any help is appreciated