Hey I am kind having a simular problem in my 95 GT. Changed out the ignition module, coil, plugs and wires, cap and rotor, but they say my alternator and battery is good. I just bought a voltage regulator 2day ($35 at auto zone.) and am going to install it tonight I will let you know. Mine has about 12 13 volts at first then the volts will drop to about 8 and shut off.