Thanks for all the responce on my higher idle with new plugs, I am real SURE I didn't displace or break anything, was rear CAREFUL, only replaced the Autolites which was regapped from .042 to .045, looks like about 12,000 or so miles on them with (Shame Shame) NKG's TR5 @.032. No pior miss, started 1st crank with the old Autolites, this in 5degree weather This is a new veh for me, had only run one tank of 91octang with mixed driving, netted 25mph, looking forward to see whant the NKG's can do.Smooth and silky, just a little high idle