Just saw the car. Dead miss off idle, intermitent skip at idle. (like a lean misfire) Popped a plug out, lots of oil for a 2 week old plug. Personally I'm tinking guides but, there are still several other posibilitys. It also has some lifter type noise and more than a few miles on it. I recomended he replace the plugs and see if it clears out for a few days and go from there. Nice guy BTW.
It just dosen't strike me as a fuel head problem, more like a bad resistor tip or fouled plug. However, the 5.6's I've had with walking giudes have done a remarkable job of mimicing a fouled plug or bad wire.
Joe