Sounds like a weak fuel pump or clogged fuel filter.Check your fuel pressure it should be 30-45 psi with key on and engine off.
SOURCE: Hesitation and loss of poer at 4000 rpm
It could be an exhaust restriction. Do you have a vacuum/pressure guage? If so you can check this at the DPFE sensor hoses. This will be either a black or a silver sensor at the back of the motor with a 3 wire connector and two rubber hoses hooked to the bottom of it these rubber hoses then hook to metal lines that go down to the exhaust. Unhook one of these hoses at the sensor then hook up the vacuum/pressure guage. It should read less than 1 psi at idle and 3 to 4 psi at wide open throttle. Any thing more is an exhaust restriction.
SOURCE: Mustang, 1992 2.3L dual point OBD 1 error codes problem
Have you checked for spark on all 8 plugs? Unplug the exhaust side coil pack and run the engine. Does it run on all 4 cylinders?
SOURCE: 97 ford mustang.the fan won't change positions
First thing I would check is all of your vacuum lines. I had same problem and turned out there was a split in one of my vacuum lines. Once I repaired it, it worked perfectly again.
thanks,
Lee
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