The idle on my friends 280CE is very rough and the previous owner stated that he adjusted the idle up and that he might have burned the WUR. What will be my options if I have to replace the WUR without going into the electronic solution?

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."