Hey guys, I'm really puzzled on this one,

I just took my DL out from the first time since winter. I struggled to get it to run solid in the below freezing weather. Now that its warm, I can't get it to stay running. It starts as usual: several flips with choke and a fire, turn off choke and it starts. I give about 1/4 throttle to warm up, and it runs for about 10-30 seconds and just kills, no stuttering or hesitation, it just quits. If I play with choke, I can get it to do this untill my arms feels like it is about to fall off.

Any suggestions?