I'm having some sort of electrical stall in my 87 Mustang GT. The car will buck and hesistate, and other times just stall completely. The car will do this whether the throttle is engaged or not. The RPMS will flux and the car will just die. No sputter, just a shut off. If the car dies, I can usually start it right back up and it will be fine the rest of the day. I replaced the Ignition Control Module and Ignition Coil and the car has a brand new battery and new plugs, wires, cap and rotor. I ripped off the steering column and checked all the wiring. I'm thinking it might be my alternator. I noticed that my alternator is reading a steady 14 volts, but occassionally will drop to 11 and shoot right back to 14. Today, the car stalled going down a hill. It bucked once and my volts dropped to 11, there was a loud grinding noise from the right front of the engine bay, and the car died. I rolled to a stop, fired her up, and drove 30 miles to work with no problems. I've had a couple people say the MAF sensor is bad, but just to debunk that theory, my car is not a MAF conversion, and to any fuel starvation issue theories, the car never sputters, it just cuts. This is definitely electrical. I had my alternator tested and according to the non-mechanic manning the machine "everything looks fine." I have my doubts about that test, but I'd rather not throw money into an alternator when it might be something as small as a bad ground. Any advice?