I think I'd be inclined to find out whats wrong before you change it....check the cable at the linkage end is not broken....remove the beauty cover ...unscrew the IMRC cover....start the engine....hold the electric motor...blip the throttle from under the hood and see if the motor is operating the gears......

V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
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