Today, I replaced spark plugs and wires with ACDelco Rapid Fire plugs and ACDelco wireset, changed air filter, wipers, and horn (which I returned to OEM). Engine is smooth as silk and the Blazer horn was a total waste of money. Damn thing sounded like a fart and was quieter than oem.
#1 plug is the only one showing any signs of burning oil. It's been a year since last change and all others were a nice brown color, #6 was not changed. I cannot remember how I changed it last time. Not only is the header in the way, but so is the oil dipstick. It's almost impoossible to get the plug wire to snap on. I got it though. The old plug wire wasn't and showed arcing at the base of the boot.