I own a 1990 Mercury (http://www.autoforumz.com/Ford/Mecury-1990-Mercury-Grand-Marquis-ftopict121065.html#) Grand Marquis, and have a question. When my car is on for 10-15 minutes (usally when im parking) in stalls (the engine (http://www.autoforumz.com/Ford/Mecury-1990-Mercury-Grand-Marquis-ftopict121065.html#) shuts off, but the car is still actully on), so I have to start it up again. The engine runs fine, so im assuming it is something with one of the fuses, because recently I had a new stero installed. Everytime I start the car the clock resets back to 12:00, also since the stero installation the inside lights only work with the the car on.

Any suggestions to what the promblem might be would be appricated.