You have the Vulcan 3.0, right? Shouldn't be that hard to diagnose. Then again I'm the type that would pull all 6 and send them down to RC Engineering to get them cleaned and balanced. How many miles do you have on her?
I have had plenty of Fords over the years and Chryslers so my ears have gotten hypersensitive.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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