:bash: the sled runs fine at secondary stage on throttle , but bogs down almost as if it running on 1 cylinder in the first stage. could it be possible i screwed up my carb set up? any thought would be appreciated.

sounds like your getting too much gas at low throttle, and when u get in the higher RPM's it can burn the gas, that would be a jetting problem, or could be ur air screws are set wrong........