When I start my bike and go to take off I turn the throttle and the bike hesitates for a moment. This does not happen all the time it seems to happen more when its initially started. Replaced the plugs, pulled the air cleaner off (cleaned and oiled). Placed Lucas Injector treatment in the tank no help. Also, Pulled the codes got the P131 & P151 codes, cleared and as of today no new codes for the past 10 days or so. Any thoughts?