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throttle body clicking noise at quick throttle kick

Fuel System

Vehicle Information: Year: 1982; Engine (Size, Modifications): 3.3; Total Mileage: 149,000 km;

I have recently noticed that if I give the accellerator pedal a quick rev from idle there is a pronounced click noise that appears to come from below the throttle body. I had it looked at quick by an experienced mechanic. He felt it had to do with a worn rubber o-ring at the bottom of the trottle body and that the click noise was a metal to metal noise when opened quickly. Do you agree? If so is it a difficult fix? I am mechanically inclined but have little 930 experience.

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