i have honda accord 1996 with 2.3l vtec manual .recently the RPM start to go up and down when the car is warm, what could be the problem, thanks

 

it is most likely a FIT valve near the throttle body that is loose inside. open it up and your should find a white ring that your should tighten with a flat head driver. Once it is tight back it off just a bit and reinstall.

???
Profit!


http://www.youtube.com/watch?v=s6wYe...eature=related

http://www.youtube.com/watch?v=eQpPc...eature=related

http://www.youtube.com/watch?v=Vd-q7...eature=related

Good luck and i hope this helps

 

And be sure the coolant is full and no air in the system.