Ok here is the deal, I did a DPFI to MPFI conversion on my 89 civic dx. I put in a D15B vtec motor, and I am running a crx si computer. The problem is, that it will run but it back fires alot, and at 2k RPM's it pulses really bad. Like it is hunting or somethin. I have checked all my wiring many times, but cant figure it out..I even tried a different ecu. Please help!!!

 

i'm not insulting you when i ask this, but do you have any check engine lights?

 

what distributor are you using?

 

Yes I have many check engine codes. I have the following codes...TPS, TDC, IACV, CRANK SENSOR, and number 9? I am also using a b18a distributer...so you know.

 

Ok now I got it running good at idle. I have a number 4 code, which is the crank sensor. I still am having problems though like pulsing when I hit the throttle and delayed throttle reaction. please help!!