Thread: Which Spark Plugs Should I Run?!?

Hi guys, just wondering what spark plugs I should run with my current setup (see list in my signature)...I currently have Iridium TR55 IX plugs but they are soon due. My engine studders on cold temperatures and my mileage is kind of crappy.

I heard many people saying iridium is not good with supercharged applications...is that true?

I know I don't have major mods right now but I will get headers and a 3.6" pulley at the beginning of summer. Should I go with the Autolites 104 right now or stick with the 605?

I know this subject has came up a lot on this forum but I can't seem to find a proper answer to my question....everyone seems to defend a different view...

606s right now 605s when you drop pulley.

I know I've already told you this...but get some AL104's and gap them at .050" when you get the pulley on.

Originally Posted by bluegtp91

I know I've already told you this...but get some AL104's and gap them at .050" when you get the pulley on.

I know lol, I just forgot to save the info somewhere, thanks for your precious advice

iridiums and platinums wont hurt anything, they just arent the best choice when youre trying to make power.

ive had better luck running the iridiums over copper plugs for some reason.. i just switched from 104's that had maybe 5,000 miles on them to tr6's and the car runs better go figure

It's just that I'm trying to fix that rough idling I'm currently experiencing and thought the plugs would be the problem...Does it on park only, muffler tips rattling and the exhaust flow is not constant...maybe misfire....go figure lol

No you need those Uranium plugs like that guy on Crags list.

these cars always seem to have a issue with a misfire at idle when modded. Just comes with the territory.

Originally Posted by Fivefingerdeathpunch

these cars always seem to have a issue with a misfire at idle when modded. Just comes with the territory.

this. i always had an idle misfire.