So this is my first saab (2006 9-3 2.0T) and recently i bought a “stage 2 aggressive ecu” off a 2004 9-3 Aero on ebay (#55569738) and had it programmed to my car at a local shop thst works on saabs. After it was programmed i still had a cel and code was p0300 for a random misfire my guess was thars the only code it had for a while but my car wasnt running at its full potential. I later went to the junk yard and pulled an ionization module off an 04 saab i believe and that fixed my issue. Car was boosting great running great but cel was still there (didnt bother scanning it just thought it was still a random misfire). About 2 weeks after i changed the ion module car started acting weird again. Not catching boost as fast. Felt less power. Recently scanned it again and got a p0325. Since the cars dont have knock sensors i figured it would be the ion module i switched out went bad so i got one off an 06 saab 9-3 on ebay and installed it today. Car still runs sluggish and code did not leave. Not to sure what it can be now since it still calls for knock/ combustion vibration sensor 1 circuit bank 1 or single sensor. Any help/suggestions would be greatly appreciated!