92 240sx throttle bogging and running rich

[imthatbyrd]

I swapped an engine into my 92 240sx (KA24de) and it’s running rich currently. The throttle bogs after I shift gears for like 3 seconds and returns back to normal afterwards. Throttle sometimes bogs while I’m in gear as well. The car throws a check engine light very seldom, but it doesn't stay on long enough for me to hook up a scanner to it. I've tried to pull the code using the diagnostic mode behind the ecu too, but haven't been able to actually get the code with it. Only thing I get is code 55. The car has a 255 ISR fuel pump, ISR fuel regulator, and egr deletes. I’ve changed the injector o-rings, changed the 02 sensor, changed spark plugs, changed the exhaust manifold, changed the coolant pressure sensor, and I've turned the fuel pressure down about 2-5 psi and the problems still persist. I've tested the fuel pump, did a vacuum test, seafoamed the motor, tested my fuses and relays, and changed ecu's. The motor wasn’t giving the same issues I’m having now in the previous car it was in. Motor, ecu, and harness was swapped over from that car. Only thing different from my setup vs the car it came out of is EGR delete, aftermarket fpr, and a bigger fuel pump. Any ideas on what the problem could be? I've been doing research for two months and nothing fixes the bogging. Any advice or ideas would be appreciated.

[nisileighty]

Check your TPS.