2005 grand prix comp g plugs?

[pontiacgt500]

hey guys i got plugs and wires to do on my comp g and upon getting a cylinder 3 misfire code i decided to change that plug. i got the plug out and it was in crappy shape but its a ac delco itr4a15 plug so i went to my work (oreillys) and interchanged that number and its a iridium plug and i had originally got tr55s from ngk to use so my question is should i stay with iridiums gapped at .53 which cylinder 3 was so im assuming the rest are, it says gap should be at .60 so i was curious if there would be a power loss, fuel mileage drop or anything like that going from iridiums to copper or just syay with iridiums? thanks for any input

[Fivefingerdeathpunch]

Copper or Iridium is fine. I choose the 41-101 factory plugs with Iridiums.

They should be no change in how it runs with either plug. I suggest a .050 gap even though the factory gap is .060. The slightly smaller gap is something I prefer.

[rickisrad]

Go with the Iridium. They last much longer and stay at a more consistent gap.

[rynoman03]

I've always gapped at 55 personally. Run Iridium if your car is stock. If not run copper AL 605, AL 105. It all depends on your setup.

[blueguy91]

104's*

or

605's*

no 105's.

[pontiacgt500]

okay ill go with ac delcos 41-101's. can i gap down o .55 on iridium plugs or can that damag the electrode or anything? thanks

[rickisrad]

Do not attempt to gap with one of the traditional tools. Use a wire type.
http://www.toolpan.com/KD-Tools-165-...yABEgIxd_D_BwE

https://www.summitracing.com/parts/shc-940816

[blueguy91]

605's.

Gapped @ .050".

Cheap; cooler plugs. Work the best for a stock~ car.