1995 buick regal stalls when heated up on hot days and wont start till it cools down temp gauge never gets over mid range

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: 2001 buick century stalls wont restart till cools down for 1/2 hr

coil

SOURCE: 1994 buick lesaber car runs till it gets hot then

I don't know this car but if I was you I would start with the ignition system. First getting extra spark plug or tests light. When the car is running good, pull the coil or spark plug wire off and test for spark. By puting the sparkplug or tests light in the sparkplug lead. Then when the problem happens tested again to see if you have sparked. also pouring a little fuel down the intake system. If the car starts you have a fuel problem. If it does not start, you may have a bad ignition module are or coil. Good luck.