Sporttrak loss of oomph


My Sportrak recently stopped suddenly and refused to start. The repair man said there was a vacuum leak in the throttle and adjusted the throttle sufficiently to compensate which just about got me home. The garage sorted the throttle out and cleaned out the manifold but the car is now very sluggish, has poor acceleration and struggles up hills - unlike its previous performance . Any ideas how to fix it very much appreciated!!! Cheers