p2188&2190 and cylinder 3 misfire. Really need help!
 

hey everybody!
My 2006 C-230 sport has been putting me through the ringer. It is throwing codes p2188, 2190, 0303. ( bank 1 rich at idle, bank 2 rich at idle, cylinder misfire)

I have done everything in my knowledge to remedy this and I was hoping someone smarter than me could lead me in the right direction.

about four months ago my car started misfiring badly to the point of almost stalling. throwing 2188, 2190 and multiple misfires. I replaced the MAF sensor with a new bosch. for about 3 months no check engine light popped up. car is running great

about a month ago my battery/ alternator light came on. I first replaced the battery because CCA were really low. light goes away for a few days. starting up my car, it start misfiring and almost stalls out (only does it once), throws 0303 code, also alternator light comes back on. I install a new bosch alternator and battery/alternator light never comes back.

0303 code remains and is paired with 2188 and 2190. I replace the spark plug, and coil pack on cylinder 3 ( NGK platinum and MB genuine). Also replaced the MAP sensor with a new bosch. Just put in a bottle of cataclean in yesterday.

Car runs fantastic. no loss of power, 30+ MPG on highway, idles fine.
Anyone have an idea?
Thank you, Colton.