ok so i recently had my timing chain break on me the other day, i got new everything and started it up today, and got it timed at 10*, but now there is some new issues, it gave me code 15 which i think means temp low or something, and the fan stays on, instead of coming on at 210*, and now you have to hold the key a lot longer for it to start, it used to start right up, i also cant get the donut(exhaust manifold flange) to seal all the way, it leaks and sounds like a lawnmower,anyone know what to do?