My car is hitting almost 92k. Should I go ahead and change my plugs now and if I do, will it make a bigger differance than if I did it @ 100k?
As of now the plugs are clean except for regular wear and tear.

 

I don't know if anyone ever replyed to you, but if you already have them out I would change them. I have never known a case where new plugs hurt a motor. Just my 2 cents!!

 

Won't hurt, but make sure to use the double platium plugs, if not the waste spark cycle of the Northstar will eat up regular plugs.

Also , I would go with the OEM Ac/Delcos, I have seen to many reports of problems using other brands, also make sure to follow the orginal wiring routing, you can fry your blower motor if you get the plug wires to close to it.

John