Rochester Monojet Fast Idle Cam - 85-158-Rochester Monojet 1 barrel carburetor fast idle cam. There are a couple of different cams for the Monojet. Th
Most of the time with a Holley, the hesitation is due to lack of fuel which is caused by the accellerator pump adjustment. If you adjust it to spray sooner, the hesitation should go away. I run a 650 Holley double pumper and would love to have a 750 double pumper, but I am going to wait for the right fuel injection system to come along.