My M50 is idling rough so I think of various things to check. One of the main things is vacuum leaks. I've never had to do much work on the engine. I've replaced a few hoses with no luck. New filters, new coil packs, 10 mo old plugs. So how do you "check for vacuum leaks"? Do you just run your fingers along the hoses or spray something near them? I don't know diddly about vacuums. Thanks.
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