my car got back from the garage just over 2 weeks ago and it cost me £117 for a gasket , 3 diagnosties clear codes and clean air presure control value fom manifoldand then £170 with a new lamber sensor. basicesly my car was stalling when i put my clutch in . now 2 weeks later my emmissions light has jus come on and my exhaust is blowing alot of smoke out of it when i accelerate. any idea?