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7.3 Idles fine, then idle goes rough
I posted this in the 7.3 Engine problems forum, but thought I would post it here too in case that was the wrong place.
My son's 96 7.3 PSD just started going crazy. It idles smooth for about 5 seconds after starting then it starts running very rough. It sounds like something clicks and the engine speeds up some and sounds like it's going to tear itself to pieces. You can shut it off and restart and it does the same thing, including the smooth idle for about 5 seconds.
Anyone got any ideas?? He has replaced the cam pos sensor with a new Ford part, the oil and filter has recently been changed, and the fuel filter is new.