Whats up h-t just bought a 93 civic 4 door with a D15B7 car runs and starts fine ...Problem first i have a check engine light checked codes and had i believe two codes 23 and 43 which are knock sensor (which i didn't think they had one) and fuel supply system the second problem is when car hits usually happens when decreasing speed when it hit about 1300 rpms the car stars to jerk more noticeable in a lower gear but does it in all gears could either of the code problems have anything to do with that? ... i then thought well what if i hold the rpms at 1300 in neutral so did that and its almost like the car has a rev limiter it doesn't jerk just has a jumpy idle its driving me nuts HELP! thanks

 

Check what ECU you have.

 

P06-A01