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Steve,
Next time it's idling high, wedge your foot under the gas pedal and lift up. If the idle goes down, then your throttle linkage needs to be lubricated.
If that's not it, next time it's idling high, hold the brake on and let the clutch out in first a little to force the idle down. If the idle stays there after you put the clutch back in, it's probably the deceleration valve.
Doug
75 911S
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