| You can inspect the idle control valve quite easily. Just disconnect it from the hose and see if it works freely. These are quite simple parts and rarely go bad. You can spray a little carb cleaner on it, but it is just a simple mechanism spring loaded.
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1984 300D 225,000 miles (hit and totaled by bad driver)
1987 300E 209,000 miles (donated to worthy cause, still going)
1988 300E 205,000 miles (still a daily driver)
1998 E320 70,000 miles (Obsidian, 17' E500 rims)
1990 300CE 88,000 miles (Silver/ black int)
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