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Originally Posted by Realnez
If your spark plugs are black and your blowing out blue these are signs of bad piston rings or bad valve guide seals. Do a compression test then go from there, about the vacumme leak, have you double checked that everything is in the right place?
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beat me to it.
for vaccum, do a leak test. theres a thread on this forum somewhere that shows you how to make one from home depot.