First off make sure your preheating this motor to at least 200 degrees, if your going straight off an cold motor your gonna be chasing a tune all day. But your rich that's all, when you pull the trigger is bogging then clearing out I'm assuming? Bottom is rich, but there's other steps prior to that, tune that hsn first then work on that bottom! Competition heater was the best purchase I've ever made, I'm so so much more consistent with my tune that its scary.