another thing, could possibly related to what phat_ridegt said. when you start the car, do you turn the key and wait a few seconds for the fuel pump to prime? if you havent been, try it and see if it makes a difference. if the FPR (Fuel pressure regulator-- little silver canister type thing on the front fuel line rail with a vac line on it) does have a leak, you might miss it. if the fuel pump is able to push the air out of the fuel line at start up, you'd likely not notice. but as far as the fuel present in the vac line, i agree. the regulator is controlled by a vaccum line and a diaphragm in the regulator. it's not uncommon for the diaphragm to get a tear/hole in it thus releasing fuel pressure, and in some cases, allowing fuel to get into the vaccum line... which messes with the operation of the regulator. --now depending on how long this has gone, how many miles are on the car, and how hard the fuel pump has been working, after changing the fuel pressure regulator (assuming that's the problem) it might actually be harder to start if the fuel pump has been weakened.... replacement of that MIGHT be required.
