Sorry, I've been out all day... I guess I'll try to answer everything at once.

The fuel filter was replaced along with the fuel pumps. (They were replaced mainly because one was getting noisy... I didn't expect that to fix the miss problem.

Looking over my post, I may not have been totally clear. The car only misses at certain mid throttle points... It runs great if you floor it, and it starts right up and idles fine. If you baby the throttle around town, you can drive the car with no indication anything is wrong. But when you try to merge on the highway, or drive up a steep hill, the thing stumbles badly. Sometimes very badly, like it won't make it up a couple of really steep hills here in town... Unless you floor it, and then it goes way too fast!

How can I check out the ETA? And why are there no DTC's set? Where can I get the information on testing that? (That's my biggest frustration/thing I hate about this car. The documentation from the manufacturer is horrible. The Factory Service Manual CD's were all but useless... I am used to the Factory Service Manuals from Toyota and Nissan, and those are great books to have when anything goes wrong... In all the years I have had the Mercedes Factory CD's, they were actually useful twice... That's it. Replacing the blower motor and regulator, and a couple handy tips when changing a water pump... Most of the time, I don't even try to look at them anymore... The answer's never there.)

The O2 sensor plugs in to the male connector, and without ripping all the insulation out I can't see the harness. I don't know where it goes, I'd hate to rip out the insulation and find that it just dissapeared immediately anyway. I suspect that it goes right through to join the main trunk line that runs throught the center console, which looks like it has enough wires to wire up the phone system of a small city.

All the wiring in the entire engine compartment looks good, no cracked insulation or other problems that I could see.

Everything looks good, but something ain't right!

If all else fails, does anyone know of a good Mercedes shop in the San Jose, California area that I could take it to for a diagnosis?