The motor runs great at idle and under light acceleration runs well. When i accelerate a little harder the motor bogs and sometimes backfires thru the carb. If i back of the throttle a little, you can feel the truck accelerating. If it idles for a few seconds, it starts moving quickly but then bogs. It seems to me like the carb is flooding - what can i adjust to help this? Is there anything else that would cause this problem?