I just had the timing belt replaced. Not out of need but more of a preventive position. Since that time the car intermitently runs very rough almost like it is starving for gas. It doesn't do it every time I drive it. The engine light is on.....based on the code its to replace a c0 sensor. The problem is I have had the guy that replaced the timing belt kit drive it twice and he can't get it to duplicate? I'm wondering if I should bite the bullit and have him replace the fuel pump and filter and bad sensor and see what happens.