On a 1987 Ford F-150 with a 4.9-liter 6-cylinder engine, the computer, also known as the Engine Control Module (ECM), is typically located under the dashboard on the driver's side, near the steering column. The diagnostic connector or plug is usually found near the ECM, allowing for connection to diagnostic tools. For specific wiring and connector details, it's advisable to refer to a repair manual for that model year.
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