[coyled]

Jim, mikie c is correct. If there is no exaust leak, then you have a lean misfire causing the pop. The reason is, when you close the throttle, there is no fuel going to the cylinders other then what your idle mixture allows. You could also raise the idle and richen the idle mixture. A vaccuum leak could cause this also. This lean condition on part throttle at higher rpm's is why the cup guys constantly rev and let off the throttle on yellows. If they didn.t, they would cook a piston on restarts as a cylinder just got too hot from a lean condition. Good luck, scott.