Hello all this is my first post as I知 brand new to the accord world. I just purchased a 2000 Honda Accord lx with the 3.0 v6. I知 having trouble with it hesitating at initial take off. There are no codes present. I have done the following repairs.
spark plugs
coil packs
IAC
map sensor
tps
fuel pump
manifold gaskets upper and lower
flow tested all injectors
EGR and cleared out the ports
adjusted the valves
tested the cat
and checked the vtec solenoid filter screen

the car runs great after about 3k rpms when driving. Now if I leave it sitting running and go to give it gas it chokes out and backfires and will eventually die. Oh and the o2 sensors and fuel trims are reading correctly and I also adjusted the idle air bleed screw and got it set to 670 rpm at idle.

 

You have replaced a lot of parts on your car. Were these parts replaced attempting to address the hesitation?

Running better at higher rpms would point towards towards a vacuum leak or fuel pressure issue. Either of these cases would throw off your fuel trims in one direction. What were the long and short term fuel trims for each bank at idle with the engine at operating temperature?