So I'm having an issue with my Audi A4. I just got it a week and a half ago. It has 130k miles. Its throwing codes for all cylinders misfiring, plus random cylinder misfire, and system lean bank 1. The car is idling rough if it even starts, and at lower rpm/idle it wants to stall out. At higher rpm it drives find. I've changed the MAF housing and sensor. If you guys have any suggestions that would be awesome, thanks.

 

Could be a vacuum leak. When this happened to me I found that I had not pushed the oil dipstick all the way down.