Hi I have a 15.5 to runs good idle when you gas it starts popping load out the carb . I took v cover of intake v move a lot exhust move little what could this be

Hi,
First make sure that the rocker arms move about the distance when they move. Then check the valves per the YouTube video:
Lawn Mower Repair Valve Adjustment - YouTube (http://www.youtube.com/watch?v=NjzX-PUjKmo)
Peace,
Clarke