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Are you losing any coolant or have any white or sweet smelling smoke coming from the tailpipe(s)? Reason I ask is that a coolant leak into a cylinder(s) due to a head gasket leak can cause misfires (don't ask me how I know). I wasn't getting the random misfire, but I did have the cylinder 3 misfire and the misfire after startup codes. The P0316 code for me seemed to be a function of how long it sat as to whether it would throw or not, probably due to how much coolant collected in the cylinder. The cylinder 3 misfire while intermittent at first became almost every time it ran and eventually started throwing cylinder 2 misfire code just before it was fixed. The dealer ended up fixing on their dime (warranty).