99 olds Alero sputtering

Hello
I have a 99 oldsmobile alero w/ about 135000 miles on it. Recently my car has been sputtering. I'd like to use a different adjective but sputtering is close to what it's doing or maybe I could say it dies out a bit. When I first take off after my car has been sitting for awhile it acts like it wants to die. When I hit the gas it kind of thinks about it for a sec and then decides to go. I've noticed when I'm on the highway and I let off the gas a bit and then hit the gas again to go faster it does this. The weirdest part about it is my Lo Trac light comes on when it does this. I'm not sure what this means. Could it have something to do with the transmission or my the fuel injector? It seems to be getting worse as the winter goes on. Please help!
Thank you!