1994 Honda Accord EX 2.2L Vtec 4cylinder

Have been trying to figure out the issue on this car for ages now, I'm at a complete loss. I just replaced the ECU however nothing is resolved. It was having very very bad acceleration issues, where it would sputter everytime I would hit the acceleration pedal until it got to around 2500 RPM and it would take off decently. I brought it in to a mechanic for a diagnostic to try to find out what's going on with it, they reset the timing belt and had the car for over a week but found nothing really wrong with it mechanically and thought that it was a bad ECU, but also mentioned the FITV coming up (However upon researching this it doesnt seem like it should be causing this issue). After the mechanic, the issue got worse and the car can't even get up to 10 MPH now without doing this sputtering. Attached is a video of me just slightly pressing the accelerator while in park.

REPLACED/HAVE GOTTEN REPLACED:
ECU
FUEL PUMP
DISTRIBUTOR
TCU (Junkyard part)
O2 SENSOR
TIMING BELT
FUEL FILTER
CLEANED OUT EGR PORTS/VALVE

 

Lot of big ticket items replaced.

Have you given it a simple tuneup?
Plugs,wires,cap,rotor, adjusted valves, verified fuel pressure, checked TPS for proper sweep? Etc etc.