Diagnosing Engine Surge

[NFULFX]

Try this thread:

Idle surge issues

alright i have searched cleaned and test everthing i can think of the car idles around 700-900 at times it will hold a solid idle others it bounceds between 7-9.also it surges when you hold the tb open say to 2000 rpm you can hear the slights surge or miss what ever you want to call it. Looking for other ideas as ive taken everything apart and changed numerous parts just to get the same idle surge.

I think oxygen sensor and your FITV (fast idle thermal valve) might be your next checks.

If you go oxygen sensor, try to get the Denso. Some other brands just suck.