hi just wondering if anyone can help me with my line.Recently when i start my cartheres a loud rattling\knocking noise.Also the car will not boost at all.It will go up to the half way line on the stock boost guage but not any furthur.The car feels extremly sluggish and unresponsive.But after you drive for about 5 mins the noise goes away and the car will boost.Even then when the car idles it keeps skippng quite alot like its about to stall.Does anyone know whats wrong.