i have a b16a in my 89 crx hf . well when i start it up it will rev to 2300rpm then when it warms up it will go to 1100rpm to 700rpm up and down . i check the vacuum lines to . when i drive it for a lil and i get on it like around 4500rpm it will go and stop like it spark or not getting enough gas im not sure .no check engine light comes on and the ecu is not flashing .you can email me at ehondab16a@netscape.net thankyou and have fun !