Jeffron420

I have a 06 cobalt ss with the supercharged lsj I replaced cam and crank sensor and made sure the lines where aligned up with #4 in top dead center I changed spark plugs and I am getting a p0017 code saying crank and cam correlation the car just cranks and cranks before it starts but there are a few times it fires right up I pulled the cover and the chain seems tight and inline. Does anyone have a idea what could be my problem or what I can try next? Thanks, jeff