I think he's talking about the throttle actuator, aka EA / ISC / CC, Electronic Accelerator, Idle Speed Control, Cruise Control.
All three functions are combined in one part. If one function fails, then the whole part needs to be replaced.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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