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if its anything like a 93 ranger, the powertrain control module (PCM), is down on the driver side firewall under the cruise control vacuum canister, and the ignition control module is under the dash board behind the ashtray.

the trigger wire from the ignition switch, which goes too twelve volts when you move the key to the start position too trigger the relay.

How do, i have a 93 ranger 4.0 that is running rough mostly at low speeds and idle, but also intermittently at other times and speeds. While checking electrical system for shorts i unplugged the starter excite wire form the starter relay and noticed that the idle improved slightly. checked it...