Engine Backfire!

[jaydub359]

I purchased a 2004 x-30 in april and have taken it out about 10 days so far, the last time we were out surfing the engine would back fire on take off once and then run fine this happened a couple of times. When I got the boat I changed both the engine and transmission oil and filter, put new spark plugs in it, and changed the engine impeler and cleaned the water filter. Also when I start the engine cold it starts great but it has a tendancy to stall out when i put it into gear until the engine warms up. Any ideas?