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Rough idling is almost always caused by.....
a disconnected vacuum hose. First place to check. Have you put a vaccum gauge on a vaccum port to see what PSI reading is? Should be at least 15 PSI.
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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