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Registered
Join Date: May 2005
Location: south western ct
Posts: 340
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procedure i would go throught after squaring all exhaust leaks:
pull your plugs to see if everything is consistant between cylinders. if that checks out (i'm not sure if a 996 has a boost/ vacuum guage) check to see if manifold vacuum is normal on engine brake. double check ignition timing. clean your plugs and generally test/tune up all ignition components (can't ever hurt). replace diverter valve/remove emissions if not in ca. or even if you are and are willing to do the work every other year. shorten injector pulse. learn to live with slight backfiring on sharp lift off. god knows i have.
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a little of this + a little of that
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