My '01 4.4 is freaking out...

[waffles]

Firstly I have to say that this is by far the most informative forum for the e53. I have done some searching, but nothing fit what was going on with my car.

Ive had the car for a while now, and it has been sitting in the garage for about 6 months 'till i finally decided to use it. I jump started it since the battery died and the engine light came on. At first i thought it would clear itself up since the car has been sitting for a while, and I even took the car in for a service just in case and the only thing they changed were engine oil and brake pads and rotors.
Now the issues:
If I ever leave the car off for about 1 hour or more,

-I would turn it on and the AC would automatically come on
-Everything in the navigation system would go back to the way it was 6 months ago..meaning all addresses i have entered since the jump starting is deleted
-CD changer would freeze up and i would have to take it apart to fix the issue (not always, but 3 times in a week so far)
- tilt steering doesnt go up and down anymore, just closer or farther.
-If the gear is on P, if I lightly tap the gas and the rpm would go up to just under 1,000, the car would die out.
- The engine light would stay on for 2 days or so, but then would be off for less than a day before coming back on.


However, the seat memory still works and whenever the AC turns on at startup the temp. on the ac is the same as i last left it.
I have taken it to a shop and he told me there are 0 fault codes.
Im guessing I might have fried something when i jump started the car.
Could it be the alternator that is damaged because of a faulty jump?
Battery perhaps?


Any insight is greatly appreciated because it is driving me nuts