Hi Pete soon as i can i will run it in to are mot bay & check the readings mate its on the top of my list. just to add as will on the back 1 no3 & no4 also no1 & no2 just seam to be less affected when u pull the plugs off the coil packs but if you do the same on bank 2 no5 no6 no7 & no8 all make a big difference. seams to be poor on bank 1 over all if you no wot i mean like a cat blocked!! put i have checked that to!! I will check the hc on idel next