I've been having this problem for a little while now, but it's lately it's been getting worse. I have a jrsc on my 97 gsr and when I give it a decent amount of gas during boost the car starts bucking or jumping, my air fuel gauge goes crazy, and boost stays constant at 6 psi. Once the car gets into vtec it stops it stops bucking and pulls normally. Another thing is after I've been driving for a while the problem completely goes away, but once I let it sit and get cold again or if I put gas in it the problem returns. I figured it had something to do with the ignition so I got colder plugs, thicker plug wires and replaced the cap and rotor. The only thing I can think of now is getting a better fuel pump. I just have the fmu that comes with the kit as a fuel set up now. Does anyone have any idea what's going on with my car? Any help is appreciated. TIA.