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Honestly this could be a lot of things including the fuel filter, depends where it's been fueled up. I'd see first if there was a code and run from there.
Some things to check:
fuel filter
fuel pump
ignition coils
spark plugs
camshaft position sensor (both intake and exhaust)
vanos solenoids (both intake and exhaust)
Mass airflow sensor
Throttle body and Disa (check for varnish build up [some is normal])
check all vacuum lines
You can clean the vanos solenoids with carb cleaner. They are easy bolt on solenoids in the front of the engine behind the radiator.
The camshaft position sensors are also easy to remove and replace.
But like I said, I'd start to see if it has thrown a code first. You don't want to start throwing money around on replacement sensors and solenoids if you can localize the problem first. Owning any older BMW requires a small investment on a good code reader. Perhaps a Bluetooth capable OBDII scanner from Amazon paired to a smartphone using the Torque app would be a good start.
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