I bought a used 3 about a year ago. Since then I have dealt with several issues.
The CEL started coming on and turning off for no apparent reason. After it stayed on long enough to take in to a shop, it threw a P0102. They tested the sensor, the alternator, and my battery. Nothing, just concluded it is most likely wiring. One of the mechanics also brought to my attention that my vehicle had been in an unreported wreck, showing me the screws and missing section of pin striping on my front right panel. After the diagnostic, and wasting $100, I got a CEL and a check battery light. Not having the cash to back a chicken run through my wiring, I've been driving with the damn lights on, hoping that nothing happens.

Well, now my engine lopes at idle. It's eating up gas and I have cleaned the MAF to no effect. Any ideas how screwed I may be?

2007 3 sedan
99000 miles
Manual trans
CAI installed by previous owner