im having stumble/ misfire problems of my own that i think are related to the oil- in- coolant- tank- syndrome thats known to plauge these cars. i think one of my plugs is fouled. i have run a bottle of fuel injector cleaner through (current tankful) to eliminate dirty injectors and the problems still persists.
car has less power than usual, and accelerates in a jerky manner, not in a consistent smooth manner like it used to.

im gonna see about changing the plugs, hopefully that will cure it as i cant afford major work right now. it probably needs a tuneup too.

anyway, i encourage you start with simple things like that,; fuel injector cleaner, spark plugs and so on before you throw parts at the problem.

there are lots of posts here about OVP sensors and MAP sensors and so on that also cause wierd running symptoms. do a search.
good luck. i will be watching this thread intently.

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'O=00=O'
bmw 2002.
long live the legend