I was driving 40mph and lost power the engine runs perfect and goes in to gear fine but my top speed is 20 mph and in takes forever to get there. Ive changed plugs, wires, fuel pump, fuel filter, air filter, distributor cap and rotor, and ignition module. I even run the codes off a obd1 code reader. I also cut off the exhaust thinking it was a clogged cat. I'm really thinking its a bad torque converter what do ya think? Its a 89 mustang convertible 2.3L with the A4LD transmission. Thank you for your opinions.