What is wrong with my 1992 Buick Lesabre?

The car will start after sitting for a few hours, or immediatly after you shut it off. but if its more then about 20 minutes after being shut off, it will not start back up. What are some possiblilities?What is wrong with my 1992 Buick Lesabre?Ignition module (under the coil packs) especially if installed with no cooling conductive grease.What is wrong with my 1992 Buick Lesabre?You need a new starter, new muffler, new tires, oil, a wash, ALL AT HONEST AL'S USED CARS! CALL 1-800-ALCAR