Ok folks, here is the deal:

After about 30 miles of driving, the car will throw missfire codes 300,301,302,303, and 304 (k-pro rocks!), and just run horrible.
This happens in/out of boost, and under part throttle cruse conditions.

Right now the car has been re-tunned to 420 at about 13psi (super conservitive). The coilpacks have been replaced, the main ground has been checked for voltage drops, car has fuel pressure, and new plugs. Compression test shows 200 across the board, and leak down test looked good.

Car has been tuned at two very reputable shops (thought maybe there was an issue with the tuning), and the issue always comes back.

If anyone has any thoughts, or ideas to what could be causing the issue i would love to hear them.
I am about to go back to NA at this point

Thanks,

Chris

 

lower your gaps on the plugs. Retest each time you lower the gap. If you want to just be sure its the plugs, lower them to .020 or .016. That will tell you if the plug gap is the issue.

 

Do a leakdown test.

 

Also check your fuel. I had some bad gas and mine was misfiring

 

Pulled plugs, and they look like the car was going lean(?). As the tune is ruled out, I am going to look at the fuel pump/ fuel pump power wires.

Wish me luck...