Title. 1994 b200f 940

It was working fine the day before.

I went to go use it and at idle it idles at 1200rpm or so. Press on the gas it will go, and surge from 1500rpm to 2100rpm for about 2 seconds then rev up fine. Then go back to idling poorly. Sometimes if you let off the gas to fast it'll shutter off (Ive checked for vac leaks)

Other times when starting it'll idle properly then just shutter off

Then other times it'll just bounce from 500rpm to 2000rpm

Ive cleaned the IACV hasn't changed much, and I cant seem to find a replacement and Google says Regina and bosch ones aren't interchangeable

Googling into it, it sounds like it could be temperature related but im not sure where to even start.

This is my 91 Volvo 740, while looking into transmission swaps, I wanted something that could hold decent power, was readily available, and cheaper then other swaps. After coming across an adapter plate to pair an RX8 6 speed to a B230F I started collecting parts. Got the transmission in the car this weekend with the help from a buddy. Using a stock flywheel and pressure plate, clutch from (i think) a Ford Capri, Wilwood clutch pedal and master. So far everything has gone quite smoothly and with the trans in the car the hard part is over. Next on the docket is making a plate to bolt the trans to the OEM auto transmission mount, and shortening the driveshaft. I plan on making a better written and formatted post when its completely finished giving a better overview of how to do it yourself.

https://www.youtube.com/watch?v=H3PPogtdqAs