mine have the factory iridiums and they say both ac delco and ngk on them.

 

Yes, misfire solved, but still have the cel on for the rear 02's, im going to bike week in daytona on the 26th til the 10th and won't be using the truck, so ill probably have to send it back to ya to have that tuned out ha? Other than that you've done an awesome job with it, power is great and it doesn't shift out of od all the time when i pull my snowmobile trailer anymore.