lucky3tattoo

So, I've got an 87 accord 4d manual... I just bought it a couple of months ago, dropped 5th and put a new tranny on her. Something I noticed before dropping it off for the work was that after it's been running for about 20 minutes, it starts to hesitate bad like it's not getting enough gas. When it's cold it runs great. because the problem shows up after warm-up i figure its not the carb. New plugs and wires so it's not that. Has this happened to anyone? could it be my fuel pump or filters? any help would be appreciated because it's a decent ride when it's running well..
Thanks