So I recently swaped a b20b in my 94 integra ls and now I seem to have a rough idle. It almost sounds like a missfire. I've already changed the IAC valve, new plugs and wires. I've cleaned out the fast idle thermo valve. I've even adjusted the idle screw out. I searched and found nothing. Any body have any ideas!?

 

have you checked the timing? maybe a vacuum leak?

 

timing is dead on. i had it timed to 16. its not a vac leak, i'm pulling 20 vac. and it seems to run a little better with a vac leak lol. i forgot to mention im running a chipped p75. i have the same prob running the ls map as i do with the b20 tune. ive even tried swapping out ecu's and that didnt help.

 

Bump

 

do a compression test. sometimes if u were running lean u mighta burned through a valve and it will cause it to idle so low it wants to turn off