hi there i am from portugal and i have a mkIII 1989, hi recently put a 76mm exhaust line,85mm mufler,hks super mega flow air intake,blow off valve,forge manual boost controler and an apexi super afc II... and some times my car is failing when i push hard in 2nd gear or in 3rd gear but sometimes its ok but in other times it fails and lights the injection light.. hi also have a bost cut sensor "i think that's the name"...help me