I filled the hpop with oil and filled the engine crankcase. Started turning the motor over and checked the fuel level in the bowl. It filled up and the oil pressure on the gauge came up. The high pressure oil is a little above 3500 psi. It set a code of P0344, cam sensor cicuit intermittent. So I pulled the new gray cps and put in my blue one that was working fine when I pulled the motor. It turns over for awhile and then starts hitting like it's want's to start but doesn't. When it does this it's rough. What should I do?