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Hello guys, first of all, thank you for stopping by and giving this a view! Okay so, the car ran perfectly after the tune but about 3 days later under full throttle, when it reaches about 6-8k it will start to backfiire about 2-4 pops. Things I've done to try to fix the problem: Changed spark plugs and gaped to the tuners specification of .02 Changed fuel filter Things the car has done to it that relates: 550 Walbro (tuned with the car) Fuel pressure regulator When I changed the spark plugs they all looked exactly the same, which makes me believe that the coils are working fine. But the plugs did look fouled as shown in the picture. I also attached an image showing my gap that was perfectly at .02 without damaging the tip. My fuel pressure is about 38psi on idle. Any help would be greatly appreciated!! Thank you!