Yep that was my first thought when it started happening as a couple of the old wires had burned through near the headers. So i figured that was the cause and put on those new ones with the ceramic plug ends. Still the same. If it was a miswired situation it would have that problem all the time, not just under a low RPM load like it does now.

If i manually shift the automatic transmission through the gears and hold the revvs above say 2500RPMs it runs fine and no backfiring. The issue only comes when i am on the road and the engine is turning low RPMS.

You can staticly revv the engine to redine without any issues at all.