You might also check to see if the proper plugs were installed and also for proper gap. The wires should still be good, you'd have to check resistance or get it on a scope to see for sure.

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The plugs were installed by an independent Mercedes mechanic. He's always used OEM parts for all the work I had done to it so I have no reason to think that the plugs are wrong.

The car gets driven rarely, but each drive is fairly long. Usually at the very least 30-50 miles each time, and at times I may drive it up to 150-200 miles in one go.
I believe the gas in it is no more than 3 months old to my memory. Usually 98 octane, and at worst 95 will go in.

Exhaust smells and looks fine. However I noticed after driving it a while in hot conditions I hear the fuel pump whizzing louder than usual.

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010

When attaching the fuel line to the filter, apply a little bit of grease on the mating surfaces.

Rob