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I've been having this SAME exact problem for two months now and STILL cant figure it out..
Ive dont boost leak tests, Changed/gapped plugs to .26-.28, converted 2gmas to MAFT setup, swapped out BOVs, and still keep getting the "hit the brick wall" feeling...
My car seems not to do it by boost, but by RPM range..
in 1st i can go all the way to 6k rpm
2nd i can go to 5k rpm @ 19psi
3rd i can hit 4500rpm at 14psi
When i do feel fuel cut the boost just drops down about 3-5psi... increases and fuel cuts again...
A/F ratios are 10:9-11:5 across the RPMs..
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