I found this on a Z3 site.
Check the resistance on your HT leads. The original Bremi leads should have a resistance between 4.9 – 5.5 kohms.
New set of spark plugs – mine responded well to Bosch FGR 7DQP+.
Put a bottle of injector cleaner in the system to clean those old injectors and finally, the M44 has a lot of vacuum pipework – there is a “tree” of four pipes (branching from the MAF bellows), under the inlet manifold, that goes to each injector. This is a characteristic of the M44 engine and is designed to help fuel atomization. These pipes get overlooked and split with age allowing small vacuum leaks – which causes a lack of power.
Don’t get depressed about the M44 engine, it shares a tough "racing" cast iron block with the M and its predecessor the M42 was said to be BMW’s most technologically advanced engine when fitted to the E30 which reportedly gave some of the BMW 6-cylinder engines (of the day) a run for their money. Remember the car is also a more lighter and agile than its 6-cylinder siblings.
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