Is it possible you might have installed the thermostat upside down? How long was it hot? You might have burned your engine up. Check compression, each cylinder should be over 100 at least, and around 130 at best.
SOURCE: Car shuts down while driving
It is very likely the part that is giving you the problem is a Crankshaft Position Sensor, they go open circuit when they get hot, then after it cools it becomes a good circuit again, this is very frustrating, had the same issue with my Buick a few years ago, replaced the coils and the ignition module at a cost of hundreds, DID NOT CHANGE A THING, the crank sensor fixed the problem and was $30.00 from Buick.
SOURCE: Low Coolant light flashing on 1996 Buick Regal 3.8
The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.
SOURCE: 1991 buick regal starting and running problem
Sounds like your car is overheating. If you have a temp gauge it should show that. If you just have an idiot light, by the time it comes on it's already too hot to operate. AFTER the car is cooled down, open the radiator cap to see how much coolant has been lost. Chances are there is alot missing. Add WATER (no sense in adding coolant if it's going to leak out) and idle the car at home. Look underneath as it warms up to find where the leak is.
SOURCE: i have a 2001 buick regal when i'm driving the car
Drive shaft universal joint worn.Or bearing worn.Have them checked out Before driving any distance.Hope that was help full
SOURCE: I have a 1991 buick regal stalls and shut off after warming up
egr valve is not opening up when the engine reaches it normal operating temperture
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