close 12 ltrs = 3 gallons

Depending on how you've been running the engine you can still have pinch at 12 ltrs I know because my 1st 7 port still had pinch at around 10 ltrs.

Jesusaves what i meant was did the revs increase quite a bit or only slightly before cutting out they should only increase very slightly

I would probably try leaning the LSN by about 2-3 hours and richen the HSN by the same and see how you go also check to see what your Idle gap is like should be around 1mm no more

Adrian