i have a b16a (2nd gen) with toda slugs..itr injectors.spoon hi-cam.spoon ecu. and fuel riser set at 48psi. i have a straight thru piping.. runs under the gas tank and bends a little to the right after the gas tank to exit at the bumper.. i experience missfire but im not so sure.. im using bkr6e plugs.. should i use something colder or is this normal to hear this"pog pog" sound at idle..?!?or am i runnin too rich ?