GSx acting weird at idle

[gst noob]

Ok, so iv had some weird idle problems if i just sit in the driveway it idles just fine. say im at a steady 1000 RPM idling the idle will slowly drop to about 800 than go back up to 1000, it will keep doing this weather the car is warmed up or cold. Iv also noticed when im going down the highway it will sorta lag out and i can hear it sputter but itsrunning fine ill put the pedal to the floor and nothing but if i down shift and put it to the floor im up to 120 before i blink. WTF

 

[sauminator]

im having a similiar issue with my 93 gsx except it goes from 1200rpm to 1500 and then back down. From what ive read this is a form of idle surge.

 

[Bojangles465]

I think it could be either the cas or mafs

 

[gst noob]

Hmm, I could see it being the CAS i want to get a timing light and prefect my CAS but im not to worried about it right now its just annoying.

I fixed mine it was the ISC. Try this link it helped me a ton. thanks guys.
Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)