I just fought a similar problem on my 90 GT. The engine would turn over and try to start every now and then but it would instantly die. You said you replaced the distributor, right? Or just the rotor button and cap? Reason I ask...my problem was caused by a broken magnet in the pickup under the stator inside the distributor.
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1990 Mustang GT 25th Anniversary Edition, 5 speed, 5.0 bored .030" over, FRPP 65mm throttle body, FRPP 1.6 roller rockers, 70 mm MAF, Compcams XE264HR, FRPP Aluminum driveshaft, FRPP Heavy duty clutch, BBK offroad H-pipe, Dual-chamber Flows, Energy Suspension engine and tranny mounts
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