Did you check all the hoses for an air leak? I would suspect an air leak before a fuel problem. Spray some carb cleaner around the UIM/LIM as well as anything that runs into the UIM. If you have an air leak the car will hesitate when the carb cleaner is sucked in.

99 CSVT Green/Tan # 84 of 2760 Built on Wednesday, September 30, 1998 15.376 @ 92.00 MPH Stock 75,000Km 96 Contour GL 2.5L V6 ATX 170,000Km