When the car is parked start it and under the hood try and push the throttle manually and see if it sticks, if it does, the bolt may be too tight or it needs lubing. I dunno too much about it so good luck.
1995 Contour LX (ATX)
KKM True Rev Sport Induction ( Video )
Alpine CDA-7894 / JBL 1200W AMP
12" MTX Subs 5x7 Alpine Mids
Brullen mandrel bent quasi-dual exaust