F50 Fast Idle.

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Hey Guys
I have an F50 Scat - DG motor with a fast idle problem.
I kinda feel that it may be a cracked or now non-existant Diaphram
in the govenor. Theory is that its feeding air from the atmosphere side of the venturi butterfly, to the engine via the vacuum hose on the other side.
If so: 1) Can this be fixed with injector pump in the car?
2) Is it an easy fix or will I regret attempting the repair?
3) Are parts easy to find? (I'm in Brisbane Australia)

Please People CAN SOMEONE TELL ME HOW TO TAME THIS SAVAGE BEAST!
Hurry Guys I feel the urge to chase Dingos on Frazer Island.

Big KEV.