>The misfire is at idle at low speed, at high speed, any time<
Does this statement mean that it misfires at all speeds?
Almost anything can cause a single cylinder misfire. You should be able to identify the single cylinder by cracking each line loose and noticing the difference. The cylinder that doesn't work won't make any difference when the fuel flow is diverted.
If this doesn't work then you most likely don't have a single cylinder misfire.
You don't have a couple of gallons of gas in that diesel do you???