Sometimes when im stopped at a light the idle goes up and down like from 1000 to 1500 then back down then back up, it just goes up and down and up and down. Anybody know how to fix this? I have a b18c1 motor in my eg btw.

 

icv is probably a good guess

 

iacv motor, behind and under the intake manifold, mess with it a little, might go back to normal, it did on my friends

 

check for vacumn leak and your tps sensor.