I have a translator with a brand new GM Impala 3" MAF . All dip switchs are set right . Car will only run right when base setting is set for a 3.5" MAF ( 0) . If I set it for a 3" MAF the car runs real rough and feels like it wants to stall . AF reading for MAF at idle are at 9 . Car runs and performs well when translator is set for a 3.5" maf . What gives ?????