The Mystery Deepens

Welcome to the continuing saga of a rough running gasoline smelling C280, which in the past week, has received the following:
New plugs, new wires, new end caps, new boots and, finally tonight, a new OVP relay. And, after all this - guess what?

IT STILL RUNS ROUGH AND REEKS OF GASOLINE

Still no "Check Engine Light" but, after replacing the OVP, the ABS light goes out like it should.

Could the problem be vacuum related? O2 sensor? Or am I looking at the dreaded "Wiring Harness" problem.

Please, any suggestions at this point will be greatly appreciated.

I'm sure as heck out of ideas.

Thanks!