just got the car like a week ago, just changed the oil and the plugs, it had a NGK r BPR8ES and i replaced it with autolite xp XP3923( its a step colder then what they said to use in the catalog i have) so i drive down the street around 4k it starts breaking up. i tried it again and it broke up around 5300. please help

 

I'll put money on the problem being the crappy plugs you put in there. Do a boost leak test and try and get your hands on a set of NGK plugs as well.

 

I would suggest you stick with NGK plugs either the BPR8ES or BPR8EIX and gap to .022"

 

im def getting some plugs tomorrow! i hope that works

 

Also if you have an Oreily's or Schucks they usually carry both plugs as well...

 

What was the gap set to?

 

they were at .027 but i have them now at .023, im going to test it tomorrow morning.

 

I made a pass and it broke up less. So what's the lowest I should gap them at????

 

I wouldnt go below the .022. It should be fine at that. Order a couple sets of the NGK BPR8ES or the BPR7ES which is the step colder plug. For the Evo VIII head 98% of people are running those from what i believe. Ive always ran them with no problems. Its a good plug and really not that expensive. Should run you $10 for 4 of them. Maybe a little more with shipping. Any local shop that does work on these cars will most likely have them for sale. Just ask. They wouldnt be on display or anything.

 

^ Actually the 8's are the step colder plug not the 7's...

To the OP...If I was you I'd get my hands on some BR7ES...I recently switched from the BPR's and was always having break up and misfire issues...and getting rid of the protruding plugs made a big difference...

 

Right, higher number colder plug. If you're running e85 you can go to a smaller gap like .018 but .020 -.022 is the smallest I've heard to run with 93

Advanceauto also carriers 8ES's.

Interesting info on the plugs, I always thought the BPR was better than the BR. I'll have to try to swap as well.

 

I always had that assumption as well about the BPR's...prior to switching that was all that I ran...but now that I've switched I'll be sticking with the BR's.