Jeep - Cherokee :: 1990 - Occasionally Stalls But Always Restarts

My 1990 Jeep Cherokee (automatic trans) will occasionally stall. The engine stops turning, the tachy goes to 0, no power steering, no power brakes. After I come to a stop I can always start it right back up. The previous owner suspected it was the ignition switch because the vehicle was stolen multiple times, column broken, etc. but I took the switch out and everything seems good and tight there. I tested the switch, not connected to the lock and I couldn't get it to duplicate the problem. It locks cleanly into each position. Start position has strong spring. I tested all the positions with the ohmeter. I drove around with the switch disconnected from the lock and wiggled it as I drove and I couldn't get it to stall. Sometimes I can go days without a problem and other times it will do it three times in a mile long drive.

I've searched the Internet for an answer but all the other posts about stalling the owners have trouble restarting their vehicle. Mine has never failed to restart after stalling. When it stalls it is a sudden loss of engine, no coughing or sputtering. The tachy drops to zero along with oil pressure, etc but the radio, lights, etc stays on. If I wiggle the key in the ignition I can't get it to start back up even if I'm coasting along at 40 mph. I have to turn the key back to the start position.