'94 850 Turbo rough when idling and sometimes looses power Topic is solved

[matpc]

Hi!
I'm getting a 2-3-1 fault code on my 1994 850 Turbo (with manual transmission) and the car is rough while idling after cold start (the ABS lights stays on a bit longer when is this happening). Also sometimes it looses power when going uphill and when doing so it starts to twitch - this happens around 3.000 RPM. Usually after the loss of power the Check Engine light lights up. After clearing the codes and the CEL the car doesn't suffer from loss of power for a bit but then this problem reappear. Sometimes it twiches when I get foot off the gas. There's no smoke but the fuel economy worsened.
Spark plugs, ditributor, timing belt with pulleys, boost control valve and O2 sensor have been changed a few weeks ago. The car is always running on 95 Octane fuel. I also got 1-4-3 and
3-1-4 fault codes before but they didn't appear again after I cleared them.
The car's got 100.000 miles.
Do you have any idea what could it be? Only fuel pump or some vacuum came to my mind...
Thanks a lot in advance!

[matpc]

Hi!