My car stalls when stopping after driving it for 30+ miles?

I drive a 1998 suzuki Sidekick sport with 2000 chevy tracker engine in it, its been running fine up until this point however it has recently started to stall after I drive it for a few dozen miles and then come up to a stop. It does have a small oil leak but I don't think that's the problem (I am going to top off the oil soon though). I recently replaced the radiator fan and a fuse because they crapped out on me when it stalled a few days ago but now it still stalls sometimes. Please help me, I do not know what the issue is?