98 ram van v6 melting plug wires

i have a 98 ram van with a 6cyl. ive replaced the plug wires twice and keep having the same problem with the back drivers side cylinder wire boot melting and then misfiring. the first set of wires was a cheaper auto zone set..i replaced with a decent napa set and the same wire melted. it seems to be melting to the metal heat shield around the plug. i have a few extra wires (good napa ones) im going to try and replace it without the heat shield and see if that works...i do find it odd that the heat shield is making this happen but i dont see another source..unless there are special wires that this truck takes. any ideas?:runaround:

i should mention its cylinder #5

Is is laying on the heat shield or just close? You don't have any "standoffs" pulling the plug wires away from the motor?

it doesnt seem to be touching the heat shield at all..from what i can tell. i have the standoffs holding the wire in place as well. i have it with the heat shield off now and the wire nice and tight and in place. that spark plug positions the wire pretty close to the exhaust manifold so im curious if thats going to work without the shield. im gonna drive it to work all this week so i guess i will find out