Try blowing air thru the sparkport. If you are sure the port is in the right spot, I would just drill it out, about 1/16 should do it; a little smaller if you got.. If your T-port sync is off, it may seem to take a lot of throttle before that port becomes active. But by 1500rpm,in neutral, Ima thinking it should have a good signal on it, If the timing isn't too far advanced.