i need major help. i have a 91 mustang and it surges, hesitates, and backfires like crazy. i have replaced the mass air with a c@l 76mm calibrated for my 19 lb injectors, adjusted the tps sensor for 1 volt, replaced the bad ignition wires, checked the plugs for fouling, turned the mass air meter every which way to see if that helped, it didn't. i even had a diagnostic test done to see what it was, that came up as no data, and i am all out of ideas. the distributer cap is kind of loose, but i just replaced it. what do you guys think is wrong? PLEASE, ANY IDEAS WOULD HELP