Hi Tomas, I read your problem and don't have any answers for you. I just happen to be a owner of Cadillac Catera that I've put a lot of work into keeping it running. Including getting a new coil that was not very good/ran the same as the old ignition coil. My supplier give me another one, but the work doing it was too much. If you been there it's barred really deep. So I read your pain in getting it to run correctly.. Do you get fix?
I took my Catera out for drive today as it was raining. I just love running the rpm up in 2nd gear and feeling the smooth acceleration of the engine with more , more power building. It great with that induction system it has.
Happy New Year and hope your Omega and you make it another year. I'm new to this forum, from sunny California. I'm driving a low mileage 1997 metallic gray Cadillac Caters for about 6 years. I've learn a lot about these machines and mine is running excellent at the moment.