my c280 1995 had the same symptoms as yours and after replacement of wire harness (bought from Fastlane) it operates well. I did not operate the car at all after the first sypmtoms. I did not want to fry anything. The indie mechanic did not bother with the throtle actuator.
A do it your self project is feasable with patience. Use the old harness as a reference.
Takes a tech 3.5 hours so expect your DIY to take more.
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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents)  *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD
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