Hesitation/Fuel pressure ???'s Plz Help!!

I ran at Atco two weeks ago. Car ran strong, everything felt great. I got back from the track (about an hour and a half drive) and shut the car off to change the rear tires back to my dailys. When I started the car back up after it sitting for fifteen minutes or so, it ran fine under normal driving, but as soon as I would get on it, it stumbled and didn't feel like it wanted to pull. I backed off the timing and increased the fuel pressure in case of det. being the culprit. Still doing it. I noticed yesterday, while playing with the fuel pressure again, when you remove the vacuum line to the pressure reg, the gauge stays the same whether you block the vac line or not. Could a vac leak be my whole problem? Thanx, sorry for the long post.

------------------
'89 Notch: R134a A/C conversion, Hedman Shorties, 2.5" MAC cat-back, 3.73 gears, MAC "Racer's choice" shifter, RAM clutch, FRPP quadrant & cable, MAC cold-air kit, 75mm Pro-M, 65mm TB, GT-40 intake, 24# inj, 1.72RR's, 190pump, alum. driveshaft, '95 GT spindles & Brakes, polished '99 Cobra wheels w/ 245/45/17 rubber.

[This message has been edited by 89NB50 (edited 03-23-2001).]