The lack of heat shields on the wire boots at this point (being brand new). They just serve to prolong the life of the wires. Really you are going to have to take off each wire and check the resistances through each one (one at a time). Write each resistance down, the resistance should get slightly higher with the length of the wire. If one is bad, you will notice the reading to be out of whack. Have a good look at each on for any defects and even within the boot itself to ensure that the plug seat is not damaged. Short of that you may end up pulling each plug to have a look for one that looks different from the others. Don't give up you'll find it yet.
1992 Bonneville SSEi
White, grey Leather interior.
Tinted windows and blackouts on headlights.
Custom high flow exhaust, Everything replaceable - DONE
300 000 kms original engine, tranny 2 rebuilds.
Playboy Bunnies Embossed in Tint. Oh Yah!
Ever Seen a Polar Bear in a Snow Storm?