[massination]

My LT1045 was sitting over the winter and I put some new gas in (it did have a little old gas left - ethanol free). Put a new battery in since the old wouldnt hold a charge. It cranks right up, sounds great, but dies within a second or two. I removed the fuel line where it connects to carb and cranked, and plenty of fuel is coming out. So its not a matter of not enough fuel. To me its almost like its not getting spark as soon as i left off the ignition. Because (I know I'm not supposed to do this), but i held the ignition even after it fired for 3-4 seconds, and it will keep running until i let off the ignition switch, then died immediately when i let go. Any ideas of what the problem would be?