Your gap is waaay to big! mine is gapped to .22 . I had this SAME exact problem word for word. It would go away then come back the next day, bad sputtering. Make sure with the iridium plugs you dont use a coin tool (pos), could damage the iridium tip. Not till i got a good gapping tool did i realize it was to big. Regapped to .22-.25 and all is good! Regap before you do anything else. Goodluck!

 

thanks fellas this **** place I live in no where carries NGK i'm waiting on my new plugs!

 

dnt mes with the spark plugs try not to open n close them will damage them.

 

what plugs are you guys running?

 

I'm running the BPR7EIX ngk iridium. I'm not sure hat year your Evo is (using mobile version evom) but that is for Evo 8's. I believe the 9's are longer. But those are the plugs I run and they're great! The person at autozone insisted they didn't fit my car and tried to point me to some other plugs. I told him those are the ones I wanted and just because his computer says they're not for my car doesn't mean it won't work.

 

Please stop going around and posting INCORRECT info. Thanks.

 

those are the ones i was told to use

 

Nice! Gap them and get back to us with the results! It should fix your problem

 

will do thanks brotha!

 

so i changed the plugs and gapped them at .025 and the cars running prime. I was taking the old plugs off and number 3 smelled like RAW fuel the white part of the plug was touching the tip!!! (im not doctor but that will cause a misfire) still has a misfire at idle but i tested that coil and its weak compared to the other one but i already have them on the way along with new wires!

 

Glad you got that figured out. I bought a new battery and double checked the gap on my plugs. Problem is fixed

 

kewl deal thanks mang!

 

i was having the same problem! i took mine plugs out and they all smelled like GAS. i cleaned and gapped them to 0.23 like 3 weeks ago and it went away. but it started again yesterday. what do u guys think??
should i get new plugs?
btw i have the spoolinup cop kit and boltons

 

Anyone Find Out The Problem... I Got A 05 Evo 8 With A 20G Setup... I Got The NGK Laser Iridium Plugs... When I Accelerate It Misfires Around 65 MPH.... Gettin Irritating Now..

 

Use the regular Iridiums, not the laser ones.

And/or double check your gap.