OK my car is hesitating when accelerating from a.

OK my car is hesitating when accelerating from a stop. Last week I had the distributor replaced because of the check engine light was on and it was driving terribly. For a few days it seemed to drive totally fine. Now, when I come to a stop and try to go again, the car hesitates real bad. When idling the RPMs stay between 1000 (cold) and 800 (when warmed up) RPMs, No sputtering or choking whatsoever. My dad said he thinks my air filter should be fine and that the fuel filter may have been replaced in the last year or so. I'm going to try to get it to the shop that just did the distributor today after work, but I'm worried it that I might stall out on the way.

This started yesterday while driving to get my laundry done (one block away) so its very consistent. As far as I can tell, once I get going it seems to drive just fine, no sputtering or hesitation in any other gears. Only the initial movement from a stop or under 5-10MPH.

The only things I can think of might be the fuel pump (hope not), a vacuum leak, or the fuel pressure regulator is bad (this happened to me with another car, but it idled really rough and bounced the RPMs around when stopped).

Any ideas of what else I could check out? I'll post more once I get it looked at and/or fixed, I know I'm not alone with this problem. Any info is greatly appreciated!