I've got a few of the parts you might need, but wiring is going to be difficult. Wiring from the stalk to the rear of the car is part of the factory harness, so not something that can be pulled out and sold. If you are comfortable with wiring, you could make up your own "harness". If you want to go this direction, I can supply the electronics module with connector and pigtail, the Vacuum actuator and solenoid with bracket, connectors and pigtail, and the cable that connects to the throttle body. If you need the vacuum cannister, I can throw that in too. How about $60 shipped.
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'87 GT in process, including GA / Seville brakes, Poly Suspension, '95 3800 Series 1 SC ( 225 hp ) 4t60e.