my h-22 is spitting and sputtering once it warms up does not do it when in neutral only when it warms up and there is a load on the engine. i believe it is electrical. i also know from experience that honda run best with denso spark plugs and i put iridum spark plugs in it could that be the problem. i also have a msd digital 6 system with an hvc external coil. and last may knock sensor keeps going off and i am wondering if maybe the sparks plugs are getting to hot and causing detanation. can anyone give me any advice.