past quarter throttle, then it falls on its face huh? i had the same prob. with all 3 of my mustangs. and 2 of my buddies. MASS AIR SENSOR. for some reason they like to go bad. its either that or your tps, but you said you already replaced that. it is a possibility that it is something else though. like a faulty fuel pressure regulator, or pump. but if you have an extra mass air laying around try that first.
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