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jon,
I'm going through similar problems. David Hunter, Art and other gurus suggest the coolant temp. sensor. This thing runs the car a bit rich until the temp comes up and then leans the car out through a signal to the ECU. $40 part if that's the culprit. Went to change mine last night and it's in a tight location under the #3 intake port (OK, it's a bitch!). I couldn't get it done...yet. I think removing the entire intake manifold is the besy way to do the job. You didn't say what year the car is, but on my kid's 92 240 if you look on the drivers side of the engine you'll see the knock sensor(mine had a 12mm bolt attaching it) and right above that you'll see another sensor with one wire attached. I'm guessing that one is for the temp gauge. The one we need to get at is further back and pretty much buried by the fuel injection connections and intake manifold. I haven't yet even gotten the bail clip connector off and was getting pissed so I gave it a rest for the night. I'll try again fresh and probably take the intake off completly. Hope this helps. Looks like the only thing you haven't yet changed or considered. Good luck.
Eric
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