Need some help guys. I changed my sparks plugs a few days ago. Not sure if that's the problem. Yesterday my car started sputtering in all gears as boost comes on and idles kind of funny. Checked the ic pipes they seem fine. Had one blow off before so I checked them. Was going to pull the new sparks plugs out later and check them. Any suggestions? Thanks in advance

 

Make sure u got the right plugs, evo 8 and 9 are different, and if u wound up not getting the factory spec ngks make sure u are on the right gap.

 

+1 sounds like thats the problem

 

if you paid like 12 bucks for the plugs then they are the wrong ones. if you paid like 50+ then check the gaps. lol sry for the dumb reasoning

 

Sounds like it might be the plugs. I have a 9MR and I paid $ 12 for NGK BPR8ES

 

....... i pay about $12 for bpr7es gapped at .020

 

well damn, i paid to much for plugs lol

 

I would bet it is the plugs as well. Take them out, make sure they are the correct plugs. If they are correct then double check the gap. Let us know what you find/if this fixes the problem.

I think the sputter you are feeling is spark blowout as the car comes onto boost. Regapping the plugs should fix this.

 

Definitely the wrong plugs...BPR8ES plugs are for evo VIIIs and older DSMs only...Evo IXs use NGK ILFR7H plugs...no wonder its running like crap...

 

Take it to a tuning shop and have them check the plugs and regap.

Check out Top Level Performance.

 

Thanks everyone for the replies. Condition corected. It was the wrong plugs. I put in some NGK EVO 9 Laser Iridium Spark Plugs ILFR7H. Cars running good. Sucked evertime I wanted to make a lane change and pass it would sputter.

 

So whats the correct gap