Hey Guys,

I have an 01 z24 cavy. Ever since I had it, its always had this weird idling issue. It idles around 900RPMS, and if i touch the gas and then let off, it drops all the way to about 500RPMs then jumps back up after almost stalling. Also, sometimes it happens just idling in the drive way. It will be sitting there perfectly fine, and then all the sudden it will drop off, almost stall then jump back up. I took a video for you guys to see what i mean. (I was in bumper to bumper traffic, ignore my squeaky clutch and dashboard vibrations lol).

http://youtu.be/9zAT3rE6FCI

Check your throttle body. Might have some carbon buildup causing it to stick a bit.