I have a 90 accord with an H22 A1 motor i just put a A6 head on but now the engine is surging from 1500RPM to about 5000RPM i have checked vacuum lines checked for codes( not throwing any) and checked some sensors. DOes anyone have any other suggestions or has had this problem??? i need help fast. thankx ahead of time.

 

Well, I'm assuming you got the H22A1 out of a 92-96 4th gen Prelude which is an OBDI car. Now I'm guessing you put the A6 head on, which is OBDII. Did you bother to grab the OBDII computer and use a OBDI->OBDII conversion harness or convert the head to OBDI.