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[Sunnyledge]

Some thoughts. If this is a vacuum leak it should be a sizable one. If not, assuming you have four properly timed and energized spark plugs firing, this should be an air and/or fuel issue. Is there any...

[Sunnyledge]

Unlikely an intake manifold gasket. Usually a hose. When I decided to replace all my 35 year old hoses I found 3 cracks/breaks in the large vacuum hose that goes from the idle valve into the plastic boot...

[Sunnyledge]

Those are ok compression numbers. Exhaust manifold leak doesn’t affect starting. Leaky oil pan doesn’t affect start up unless you are so low on oil that your engine is about to seize. Not likely if...

[Sunnyledge]

Was this condition gradual in onset, increasing over weeks/months, or rapid in onset? You obviously have some spark and some fuel. The M10 is really sensitive to vacuum leaks, causing stumbling idle with...

[Sunnyledge]

Fuel pump relay for E30 M10 per factory BMW repair manual. ...

[Sunnyledge]

Can you provide a video with audio of the engine start up and running/misfiring?