What makes you think inlet manifold gasket ???? I would be looking more along the lines of TPS. The throttle is "not a cable in ur case is it ??? Id be looking at the fly by wire mechs. ECU wizardry perhaps. Best of luck. Daz

I was reading a few other forums and it was suggested that it possibly could have been a common fault for the BA turbo so i am trying to eliminate one thing at a time. Next on my list was the TPS.
Now i have also heard that it may be something to do with a pedal sensor but am unsure on how to check this.... any ideas?

fond another trans fluid-coolant-http://www.fordmods.com/the-garage-f53/milzy-s-2003-ba-xt-sr-falcon-t103321.html?hilit=ba auto&start=30,done a search and found another