I am almost certain that I will have to replace my vaccum hose again at my next tune-up this fall. My question is, why would my car need its vaccum hose replaced often? Could there be a fault in my vehicles air supply? It sputters going up hill, Ultimately in winter it sputters almost every start-up and often while driving it in the winter season. My car is 9 years old. It had its MAF Sensor replaced last year, it always gets the air filters replaced ( I do it myself). Also could the sputtery start ups be associated with the fuel system? Like the fuel injectors? And is it hard to replace them? Also finacially?