when its cold ,if you choke or push the gas peddle several times,does the engine start better.If not , when the engine is cold,push down on the gas pedel.All the way down to the floor and keep it there ,then start the engine.If there is an emprovement,then you have a carb leak and it is flooding.By pushing the pedal down to the floor ,you are opening the butterflies to your card and letting as much air in as possible.