Question

where is a distributor engine speed sensor located on a 1996 Ford F150 5.0 liter engine?

Answer 1

Code 0320 is "Ignition Engine Speed (PIP) Input circuit fault". Inside the distributor you have a module that sends a pulse to computer as the rotor turns. Your module has either come unplugged, severly corroded, or is faulting. It will be near the brake booster.

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The difference is whether your ignition control module  is mounted on your distributor or by your fender.