1996 blazer

the ignition sys. has been arcing from the coil and coil wire, i replaced every component in the ignition sys with no results (2x"s) i also did resistance, capacitance and ohms chks on coil, distributor,wires etc..every thing chks good, i had two dealer ships check it out and they cannot find the problem either at this point i don"t know were or what to do?

Can you see the arc?Like at night time. An arc will jump from the frist place it can get out of (normally a crack in insulation) to the first grounding point it can reach.I would look to see exactly where the arc is coming from.Beings ur coil produces the spark,and you changed it and the coil wire.Id like to know more,when u get a chance