Little background on the car I have changed the plugs they should be all good so are my plug wires. I took my car to the track and couldn't get it to 6k without crazy misfires. It pulls great until about 5 then cuts starts popping. I have a tune by Madz28. Could it be not enough fuel bad tune hitting rev limiter?
I am kinda lost cause the car runs good up until 5k.

 

Just took it out again and now it misfires even lower like at 4k the problem was definately worse. Could it be just the cap of the Opti probably not. Also could this be early signs of Opti failure and my car might not crank up one day it is my DD.

 

change the plug wires when you did the plugs???

I had a coil wire that was fried that came off... when I put it back on those exact symptoms arose. (I must have bent/muscled the coil wire in the process)..

Anyway, a new coil wire fixed it PERFECTLY... (in your case it might be any one or more of the 9 wires total)

JT

 

opti might be going out....