any weird idle stuff on mine has always been either dirty terminals or a bad battery. So, start with the cheapest option and clean the battery cables and terminals with a wire brush. put 'em back on and idle it up to about 2000 for a few minutes (should sound nice with the monster exhaust) and see if the problem is sloved. If it's not, then take your battery to checker and have it tested.
Now, if it's really knocking it might be something else, but sometimes a weak charge can cause some weird stuff.
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