Engine Sputters/Hesitates at 2000 RPM

sounds like the choke is not opening all the way or sticking

I was thinking about this last night and how it's acting and I sort of agree with you. I have a manual choke cable and now that I think about it, it was sticking out farther than usual. I think I'm going to try readjusting it or disconnecting the manual choke cable and see if it does anything.

definitely sounds fuel related.

I was too, but when I checked my fuel pressure last night, it was at 6.5 psi at idle. Does fuel pressure lower while driving?