Sorry so long, i really need help and i'm trying to make it clear. I have just installed my h22a into my 94 prelude and i have the p13 jdm ecu with it. It reads 4w which i suspect to be the 4ws prelude. I have the car running. It runs diecent when i drive it but the idle bobbles up and down. It stutters when i first it the gas from an idle. Also, when i try to hit vtec, it won't hit it and the redline stops at 6800 rpms. Its supposed to go to 7500 rpms. I checked my ecu to see if it was throwing any codes and it blinked a 12-EGR lift sensor malfunction or circuit fault, 21-VTEC spool solenoid valve malfunction or circuit fault, and 36 which i don't know but on another forum, they said that it was for atts so i'm not worried about that cuz i don't have that. But i tried checking the other two codes but no luck. Any idea's or comments would be greatly appreciated thanks.

 

Don't worry about code 12 you'll always have that. Get rid of code 21. Thats your problem. Check the plug, wiring and continuity. I'm not up on the ATTS so I'm not really sure about that. But you dont' have that hooked up or in the car right? Maybe that ECU is looking for it and you need an ECU that doesn't have ATTS.