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Shake the box. Does it rattle? If so, you probably have a transistor with a broken lead. Open the box and look at the board.
If you have access to some electronic equipment like a bench power supply, and have or can make a suitable distributor signal simulator, you can fix it yourself.
MFI runs rich at idle. Usually moderately rich. That is what gives the initial throttle response to raise the revs when the throttles open and allow more air in.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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