The idle has become very poor in my 1983 M102 w123. The car recently went on a road trip to San Diego from Amarillo, and back. When in San Diego it got fluid changes. The idle at this point feels like its about to die at almost any second. Whenever a little throttle is applied, it smooths out and feels nice. Any thoughts?

Also any advice on where to find tuning advice for a carb’d M102 would be helpful.

Thanks.

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1982 300TDT
1991 190D
2022 Metris