we have changed fuel rail pressure sensor. Thought maybe that would help. The heater grid light and chime also comes on. It will turn over but will not start in the mornings. I tried to start it this morning and no start. Went out about 2 hours later and it starts. Not easy normal start but starts. The tack is not working either and other small things intermitently do not work also. Can you help me with any suggestions do not want to keep throwing parts at this truck.