Hey guys, we finally got our truck up to the dyno to have our tuner work on it and we ran into an issue with it pulling serious timing due to knock, at the time we had 87 octane in it which we thought would be fine for 10:1 compression, well we came home and filled it with 92 and it still seems to be pulling timing, well tonight I put about 5 gallons of 110 mixed with 3 gallons of 92 in it and still the same thing.

Here is my question, our truck is a 408 and has brand new Delphi knock sensors, but the wiring harness is from the old junkyard 6.0. Has anyone had issues with that wiring harness causing ghost knock?