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The idle air control valve (IAC) is located on the passengers side of the upper intake manifold. Looks like a silver film canister with a tail and two wires.
The 84-87 2.8's had a Idle speed control acuator/servo (motorcraft part # CS76A), but I don't think the 88 2.9L fuel injected engines have anything like it
like ken00 says IAC valve is located on the upper manifold and looks like a silvery canister right next to the tps, iac's as far as i know 86-up b2's have iac's
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.