HI, just purchased some Denso Iridium IK20 for my 5th gen based 'lude, read and searched, but unsure about gapping, I was @advance auto, and i was informed that u can gap it w/the regular tool, but i've heard somewhere else, that there's a SPECIAL tool to gap denso iridiums, all heard, not verified. What's correct? maybe it's already pre-gapped and I don't have to do nething at alll...any help is appreciated. If done correctly, i'll post the performance of these plugs. thanks.

 

You should not need to gap platinum or iridium plugs.

 

yes they are factory pregapped