I have a 2000 SLS Northstar that frequently stalls. It's very strange, it stalls just after engine warm up to operating condition. It restarts with no problem. After it is warmed up, it's fine. What could it be?

You need to do a "search" here for crank position sensors. That era of Cad was known for faulty early production crank sensors failing. One of many reasons an engine can stall.

Did the crankshaft sensors fix it?I had mine done 3 yrs ago,but im thinking there bad again.