Ok my car is a little different, it's a euro 280 SEL. The car runs fine just a little rich. High on the CO and on the HC. I've looked on the posts here and went to check Pin #3 and there was nothing in pin #3, the slot is vacant.
Can anyone give me some input?

I have a pic of the sensors on the right side of the head, can anyone give me a clue as to what they are?

A little more info: I did feel a change in the perfromance recently as was opening it up to let out the cob webs and when I opened it up it had a serge of power like the throttle actually really opened up. As if the secondary's opened suddenly. The idle switch also shows a wide open throttle switch. I guess it's possible for it to stick. What do ya think?

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1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)