I finally figured out what the problem was. The carb kits came with a new spark plug so I replaced it at the same time as the carb. Apparently the plug was bad because when I put the old one back it it ran great! Problem solved. Thanks for all the suggestions.
Try running the blower on a different power source.. "generator" especially if it is using a ECM motor.
The problem usually bad power... the phase alignment is not at 15° angle this is also called the (power factor)
If your project is on the end of a power lines or the outer edge of a utility district you will experience this problem more than ...