is it on Wot if so may need to do a tune up IE spark plugs and ignition
coils, could also be a boost leak check for loose inter cooler hoses. I had
some issues with my 996 wear at Wot in 3rd gear it would start to stutter
and I would not reach peak boost changed the plugs this weekend and is
running a lot better. Not getting any hesitation now during Wot. Wot = wide
open throttle btw.