I swapped coils and spark plugs but the misfire remains on cylinders 5 & 4. :-(

Also did the "cigar" smoke test at night and saw nothing escaping. But, it is difficult to tell, so yeah, I am going to do a proper one with a smoke machine.

I have never done a compression test, but I have been looking into that and I am going to get the gauge to do it.

I figure all these tools I can still use in my other cars, so I don't mind spending a bit of cash on them.

I am also charging the battery, to rule out low voltage as a culprit.

If all those don't reveal issues, then I will try new spark plugs.

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2001 BMW X5 3.0i, Automatic, Gasoline