Originally Posted by mugenb46

what fuel and plugs are you running Joe, and be sure the head bolts are tight and carb pinch bolt and back plate, my test 3 port did the same thing, i went through everything and used a P3 during breakin and sealed the pinch bolt and back plate, the head bolts where a bit losse and i think this is what caused it, are you using the extra shim, i put mine in after that, let me know.