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Try checking the oil fill tube and the dipstick tube - both known to get brittle and break, causing a large vacuum leak and rough idle.
To check the oil fill tube, remove the oil fill cap when engine is idling and you should feel / hear a slight vacuum and a stumbling of the engine.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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