Engine Performance problem
1986 Ford Mustang V8 Two Wheel Drive Automatic 122 miles
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2 weeks ago i was driving down the road and then my car suddenly started to hesitate horribly even lose rpm's when ever i hit the gas and wanted to stall when approaching a stop,i will also notice power loss and in and out when coasting or at part throttle.i just changed fuel filter,tps sensor,distributor,iac motor,and a full tune up,a holley fuel pump installed 4 years ago,2 years ago i had the engine swapped for a new 92 negine stock only about 8000 miles so far.could it be the coil?old crappy speed density computer?please help.

Test the coil's primary and secondary windings/ignition control module and check the fuel pressure-