I replaced both my O2's for Bosch ones. It still stumbles at idle, and dies when I put it in gear sometimes. I really do think its my MAF. Yes, I clean it once every 3-4 weeks. Also, after I installed the 02's. I reset my computer. The car ran incredible for a few minutes. Maybe I have a big exhaust leak where the 2 piece H-pipe meets? BTW, cannot run codes, my car's computer will not connect with code scanners.