I recently had a local shop drop a completely redone 7mgte into my car. It runs great.. purrs like a kitten at idle. I however am having some issues that i would really appreciate some help on. First off the brake booster which worked fine previously now does not seem to work at all aka hard as hell peddle and damn car is impossible to stop, I found that the check valve inline between the intake manifold and the booster was placed in backwards..I reversed it hoping problem solved.. took the car out for a spin still no power breaks. Then whenever i would push in the clutch to coast a bit before engaging my lower gear to ease my lack of power breaks i started to cut out. check engine light is now on and brake lights would come on. Any advice would be great.