Hi guys,
Here what I've got into:

Yesterday came back home to pick up some documents and had to run back,so I attempted to restart after may be 3 minutes I halted the engine,so..it would crank endlessly,so when the point of usual start up was passed I would turn the key to stop cranking.I tried several times with no luck,so I took the wife's key and it catches,but after few revolutions dies,all while starter is still cranking,and finally fires up.
I halt the engine and swap the key,and to my surprise it continues cranking,so after may be 3 or 4 attempts it finally starts.
So I think,should be immobilizer or ignition switch related,departed to do my business and didn't have the problem until today's afternoon,when I went to pick up some stuff from a friend and had to restart in 5 min.
SOOOOOO embarrassing to crank with the friend in the door checking out,anyway...so it finally starts after I hit lock and unlock.
Come back home and try again let the X sit and go inside for an hour or so,go back start and it fires up as usual,halt ,restart and get just cranking,lock...unlock and 3 attempt I get it started.
Weirdddddddddddd.
Any ideas?
Ignition switch? Bad gas? Clogged fuel filter ? EWK module or how the hell it is written...
I tried searching here...not much luck so far.
Any ideas?
it's 2000 4.4i

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e53 '00 4.4i Oxford Green II Freshly rebuilt tranny(2nd one) and transfer case/front shaft
e70 '08 3.0si Sapphire Black cinnamon leather 7 seats
e61 '06 530XI Sports Touring Silver - SOLD