I have a gsr swapped into my 93 civic sedan and everytime my car warms up it always wants to hesitate and then almost die, only when I move from a stop though, I need help! It's driving me crazy. Idk what to do with it anymore so any help at all will be appreciated.

New parts:
- distributor
- plugs n wires
- starter
- battery

 

Also, I have to hold my rpm at 2500 at the stop if I don't want it to die...

Plus it has 4-1 header and 2.5" exhaust, stock muffler