launched my 318i, now it doesn't run

[taiden]

Alright, sooooo yeah. It's raining here in beautiful Maine, and I decided whilst at a stand still to launch my 318i. Rev to about 4.5k and ceremoniously dump the clutch (but not in a side-stepping fashion, slightly more gentle).

The car bogged down and proceeded to run like ass.

At first I was sure that it was my AFM stuck wide open, as was previously the issue. At first it was running, but would hardly operate under load. After checking a few things, the car won't even run now. It just sputters randomly.

The things that I checked:

vacuum lines
AFM
all visible EFI related plugs
checked for loose plug wires
checked for damaged cap/rotor
cleared the engine to check for flooding
The car is currently on the side of the road somewhere and I will be returning to it to try some other things. Any ideas would be appreciated.

[accident]

I had this happen once in a 325is. Turned out the intake boot had come off the throttle body, but only on the bottom so visibly it looked still attached.

[taiden]

I ended up finding it:

Pretty funny, had excellent spark at all four plugs, swapped in a spare AFM, car still didn't run, but it was backfiring sporadically.

Pulled the cap off, and turned the rotor. Uhmmm. I don't think rotors are supposed to turn 360* when the crank isn't moving.

$7.60 later at a NAPA that was a 1/4 mile away and I was on the road again.

The culprit:

[jeffnhiscars]

You spun a rotor ? There's a first for everything !!

Beats spinning a bearing :-)