This truck came in for a no start problem. No spark. (It's a Tusk 350CG-17 with the K21) After replacing the cam and crank sensors still no start but a blown fuse was found in a harness above the valve cover. Fuel pressure was also high. After changing the regulator it would start when it felt like it. We put the original cam and crank sensors back in and it took right off. After troubleshooting sure enough it was a bad TVH cam sensor. Thanks for the help!