Having some problems clearing this code on my truck. It's a 2003 7.3 with a tuning kit. I've restored everything back to stock but can't figure out this code. I've had this truck for three years and have already replaced the ICP sensor. I know the DTC P1316 code has to do with the IDM and/or the injectors, but the truck runs fine with no misfires, no smoke and starts in the cold. I'm trying to get my hands on something to do a buzz test, but does anybody have any advice or can someone point me in the right direction in the meantime?