Hello,
I have a 93 5.0 5-speed convertible that was doing almost the same thing. It would bakc fire then run better come to find out that the fuel injection harness grounds to the back of the drivers side head was loose and arching. It was not making a good ground for the MAF either. The ground attaches to the drivers side head just to the inside and under the crossover tube for the emmisions. Hope this helps.
Jeff Cardwell
Thunder Valley Mustang Club
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91 Coupe AOD 3.73 15/8 Shortys 75mm maf Explorer Intake 70mm Throttle Body Best E.T. in 1/8 = 8.94
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