I don't know if there is a way to test the coil ... at least I don't know how to. I recently replaced mine thinking it was going bad, now I have a coil with 227k miles on it that works perfectly well.

You may have a clogged fuel distributor, or a bad fuel pressure regulator. Again, you'll need a fuel gauge to test. I recently ordered one from J.C. Whitney that has yet to arrive.. but when it does I'll be doing some testing to my system.

A couple of other things to consider: cylinder compression and built up carbon in compression chamber.

Good luck :p

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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi