My '86 240 wagon has been acting strange as of late. Some days the rear window de-fogger comes on by itself and won't go off until you cut the ignition off....hummm other days, when I stop the eat lunch, and sit in the car, the radio won't work, unless the car is running, sometimes it works with key on acc. On hot days when I have the A/C on I can drive 15-20 miles and the engine will develope a miss, and run poorly. Is all this something I can fix or do I need to look for another car? Thanks