try reseting the idle. unplug the iac motor. start the motor (you may have to have a friend keep it running under the hood with the tb), adjust the idle screw on the tb till the rpm's are sitting where you want them then plug the iac back it.
mine done the same thing and it fixed mine.
Turbo Turtle Garage
Zetec and Duratec Turbo kits, engine building
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