Hello all, my car is misfiring at WOT and was wondering if you could help me out find out the issue

buschur built motor with fp black running 30 psi.

1. im running on pump. I have ran fuel injector cleaner so injector should be clean
2. i have just replaced my sparkplugs. same plugs same gap (.025)
3. im running spooliin up COP. its been on the car for about 10k miles

What should i try replacing next? COP?
and advice/ inputs would be helpful

thanks

 

Gap your plugs to .020

 

+1 at .020.

If that works, you can experiment a little bit increasing the gap without recreating the misfire.

 

I will try that.
but with me running same setup same type of plugs and same everything else, i dont see why smaller air gap would be necessary on this new plug..

 

check for loose connections at all the COP connectors. Also gapping the plugs down should help.

 

I agree with the others, drop the gap down. I run as low as .017 in high boost applications on stock coils. What spark plugs are you running?