I have removed the inlet pipe between the intercooler and the throttle housing. When i cover up the hole inside the throttle mouth the revs drop to 800 which is perfect. am I right to asume that if there was no leak behind the butterly then the engine would stall and because it dropped to where it should be this indicates either that the adjustment screw is worn (unlikely) or that as someone said above, the plennum gasket is shot.
who needs Ford anyway!!!!!!!!!!!!!!!!!!!!!!!