i had the same problem on two of my mustangs, and 89 and my 95, a buddy of mine had the same prob. on his 90. find someone with a mass air that works, that was the problem with all of mine. it would rev fine part throttle but when you would give it about half throttle it would fall on its face. it almost acts like its reading full throttle when the gas is only at 1/4 throttle. that would be the first thing i would check, from my past experiances. hope that helps.
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