i took my 1993 scooby to scoobyclinic last weekend and on the way home when accelerating it was stuttering it`s not doing it all they time but most times i drive it also the boost don`t have that kick anymore like it did i have had fitted a decat down pipe and a bigger up pipe would this make the boost more smoother also had all liquid in the car changed and it also crounches when i put it in to 4Th gear but not all the time seems to do it more when hot