What Steve says makes sense about the coil wire boots.

M104 engines use coils that are mounted directly on the spark plugs, replacing the distributor at the front of the engine. Each coil pack provides spark to two spark plugs at the same time, one connected directly to one plug, and the other with a short, high tension lead that piggy-backs to the next spark plug. So there are 3 coil wires and 3 high tension lead wires.

If the boot under the coil wire is bad, I guess you'd lose spark to two cylinders.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".