The engine chokes and stalls, What could be the problem?

There are multiple possible causes to the engine choking and stalling. Hands on professional testing utilizing a BMW compatible diagnostic tool and reference materials like a shop manual and wiring diagram is needed to find out what is happening to your vehicle. Diagnostic trouble codes are most definitely present if you have a warning indicator on, such as that of your transmission. This may or may not be related to your "choking" problem, but must be checked regardless. Always address what you know to be wrong before attempting to guess or theorize at anything.