I have a 1991 Benz 420sel lately it runs smooth when it's cold and it gets rough as it gets warm...help

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Asked by Nov 29, 2016 at 10:49 AM about the 1991 Mercedes-Benz 420-Class 4 Dr 420SEL Sedan

Question type: Maintenance & Repair

The car was running rough then I put Lucas in and it got better. Lately it runs
rough when it gets warm

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