Join Date: Oct 2005
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P1316, and almost all other IDM codes are *typically* (but not always) related to the under valve cover harness, or the valve cover gasket connectors.
If your IDM itself has gone bad, you wouldnt be driving your truck.
Start simple and check the connectors going into the valve cover, and the harness leading up to the valve covers. If it looks good on the outside, its a good chance the problem may be inside the valve cover.
If you have access to a really good scan tool such as the autoenginuity, there is a way to make it talk to the IDM and pull out more specific IDM codes, such as what specific injector is causing the IDM to complain.