Sometimes when my cars between cold & warming up, it'll be very hesitant to accelerate unless i push the pedal to the floor, than it reacts to the sudden increase and jerks into normalness... It's almost like its bogging if im at mid throttle on the pedal, but once i floor it, it goes fine, than next gear i have to floor it as well and than it'll eventually about 10-15 minutes later stop doing it... It does it even worse if i have the a/c on... Maybe a bad o2 sensor..?? CEL 43, Fuel Pressure Supply or something like that, i've changed injectors, plugs, cap, rotor, wires, & fuel filter and it still does it..

 

wow hmmm try disconnecting the vaccume line bettween your intake mani and fuel pres reg, pulg the manifold side up and test drive if it acts normal you know its your FPR.. what this does is causes the FPR to close causing pressure to build in your fuel rail by not releasing the fuel back to the fuel system. dont run it like this forever and its highly not suggested if your running an afermarket fuel pump

 

naa d15b7 completely stock, no fuel upgrades until the motor gets pulled... i took off that vac line and it seemed to run fine but its hard to honestly tell cuz the problem only happens ever so often, its not a constant issue making it harder to pin point...

 

sounds like fuel problem i would say clean your fuel pump and injectors they could be stopped up but you did run it with the vaccume line off?? if it happens ever so often pull it off next time and see how it runs remember to plug the manifold or your sensors will go hay wire