Engine Mustang 1995 GT - RPM fluctuating while driving and surging

dcm0123 said:

Very informative link. Is "the constant control relay module" the same as the body control module? If not, where is this module found?
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Yes, at least on Rock Auto, it's also listed as "Powertrain Control Module Relay" and, "Radiator Fan Relay". The CCRM contains 5 relays, one of which may or may not be solid state, and some other electronics. It controls power to the PCM, radiator fan, both high and low speeds, AC compressor clutch, and fuel pump, and I don't remember what else. It's located behind the radiator on the passenger side, mounted on the overflow bottle support.