I have a 2006 bmw 330xi with a manual transmission, 146,000 miles. Wont start

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Since buying the car we have had battery issues. Had the battery programmed to the alternator, no luck. Seems to be a parasitic draw. Bmw dealer said it needs a new jdm console. Was running fine then one day seemingly out of the blue it started stalling when idling or coasting. I pumped the gas and the clutch to keep me from stalling and get me to work. As soon as i got to work, parked & let the engine run. It didnt stall, enginge starting reving on its own going up to 2000 or 3000 rpms and back down again. On the drive home couldn't get any power to the engine. Wouldn't go over 1500 rpms. Parked it, now its cranking but won't start. Bought a bmw code reader, pulling different codes everytime, mostly related to throttle control issues. Adjuster for the intake manifold was broken, replaces that with no luck. Also cleaned out the computer. Please point in the right direction. My fiance is a mechanic, but not bmw. Can't afford to have it in and out of the shop, can't trade it in if its not running!!!