Well my blaster runs like crap. I just got it back from the shop for the THIRD f'ing time and it still doesn't run. Don't even get me started about how mad I am at those retards. Anyway, it bogs when the throttle is applied and then hits the power band. After that I can hear a pinging/knocking noise at higher RPMs, and it doesn't run as strongly as it should. I pulled the plug and it was very black and wet. Any suggestions?