Son just bought a nice 95 GT 5.0 Mustang. Runs great, shuts off every once in a while, turns over but no fire at coil when this happens. Replaced stator in distributor. Marked distributor at base of shaft with relationship to block. Marked inside of cap with rotor pointing at #1 wire on compression stroke of #1 cylinder. Repaced in same location(or so I think), starts but slight surge in idle, throttle not crisp, timing mark about 60% BTDC when runs best. Can pull back to 10% as spec(with SPOUT removed), but runs bad. Tried setting distributor 1 tooth forward and back of #1 on cap. Runs best where it looks like it should be. Something is still not right. One tooth either way of #1 on cap is around 1/2 inch of rotor movement. Is this correct, or am I not hitting 1 tooth, perhaps 2? Thanks.