Make sure your scanner can do OBD1. All pre 96 Fords are OBD1. 96 and newer are OBD2.

With out knowing specifically what your car is doing or what symptoms you have it is impossible to guess what could be wrong with your car.

Could be anything from a vacuum leak, bad ground, bad coil, bad MAP sensor, inoperable O2 sensors, dirty clogged injectors, bad wiring connection, faulty TPS sensor, FPR going bad, clogged fuel pump. Your problem is too vague to give you an accurate answer.

Hurst