It may not be the tps maybe its the mass air flow i think its the tps though for reading boost, there different in boosted cars. I know you have to switch them out on hondas and other cars when providing boost. If not your computer can't compute the air flow ect check it out on line its a long explanation and i don't have that kind of time lol! look into it though and you don't have to run 14 psi you can turn down the psi like on all turbo cars.