I am kinda new to hondas so dont flame me please. Anyways I have a little china sand rail that i put a d15z1 motor in and as i said i am new to the hondas and i think i fucked up when i did this swap. I used a p-28 computer, and made my own wire harness with info off this site. The engine runs fine it has a little stumble in the idle if i let it idle for more then like 3 mins. It still runs good other then that. In my quest to get more power i let some friends talk me into getting a 91SI mpfi intank, for the bigger throttle body. I already converted the o2 to a 4-wire with the p-28 computer. I need more power. The rail is still really slow, and i am disaponted with the power. Maybe i am dumb and have the wrong computer/engine combo, but its what i was told to do. If anyone could help i would greatly appreciate it. Let me know if i am stupid and need to get a diferent computer or what ever. I was looking into geting a nasty aftermarket camshaft, but cant find anything for the D15Z1 motor. any advise would be great. Thank you in advance chris.