Have you done wiggle test on the loom to see if you can get it to stutter standing still?

My old Saff wore the loom insulation the bend where it comes over the back of the plenum and that gave high rev boost probs, also I've stripped looms to find the injector wires burned together where they bend over to the injectors. Ill dig the graph out to see if it starts at 4k because I had it on the rollers while it was doing it.