Rough Idle Redtop Sr20det
 

Hey guys so I got my car running and it's got a rough idle now. It starts right up with no problem but the rpms go up and down and then it bogs and dies. If i give it gas it also just dies. So i thought maybe maf, i unplugged it and it stopped stalling but the rpms still go up and down. I also have no o2 sensor, I didnt know if that would cause this to happen though. Heres a list of my parts:

z32 Maf
Walbro 255 fuel pump
550 injectors
Fresh Rebuild
Greddy FMIC
HKS Bov (recirculated so not that)

Any help would be great. thanks guys

Sounds pretty much like a IACV that needs cleaning and adjusting.
it also looks like you are new to the 240 world so let me help you out by advising to search before starting new topics.

Most of the guys here dont mind helping if you are genuinely stuck, but if you cant be bothered to search dont expect us to provide much help either.

HAHA

Well your first problem is if you have a stock ecu, you have no O2. A stock ecu needs that signal. Put an O2 sensor in the thing and get back to us.

A redtop gets the skinny O2 I believe.

If it's fluctuating up and down in a rhythmic manner it's usually the coolant temp sensor.
pull codes.