1995 Mazda 929 Good LORD, I need a miracle worker!

Engine Performance problem
1995 Mazda 929 4 cyl Front Wheel Drive Automatic 185k miles

I have a '95 Mazda 626 w/ 185k 2.0L automatic. Aug of '07 I had the head gasket kit and belts replaced. It ran beautifully. In Nov '07 I replaced plugs, wires, cap, rotor, coil and radiator flush + thermostat. Still runs excellent. In Feb '08 with no prior warning or indication of engine problems it stall at 45mph. It would turn over but wont start, I replace the Battery. It starts right up.20 mins later at 30mph stalls again (now I'm pissed). So at 2 a.M. Towed to shop. They replace Fuel filter, pressure reg, reset comp. The next day 50mph stall on highway (now I'm 4kucgfrti7jhf!) And almost $2000.00 poorer from parts. Back to the shop. They say codes for Mass Air Flow come up but the believe the signicant problem is distributor module. So another $900.00 I replace MAF, Distributor, + O2 sensors and new plug wires. The mechanic test drives it for 45 minutes and at 30mph stalls and had to have it towed back to there shop. Why is this "EXCELLENT" conditioned car with basically ALL new parts not running? PLEASE GOD HELP, I'm a single dad and it's our only car!