I have a 95 S-10 Blazer. It starts fine, runs pretty well going down the highway but the problem is whenever I stop at a traffic light or am in slow traffic or even when I first put it in gear it runs really rough, and sometimes dies. It doesnt have the take off power it should almost like a choke sticking it seems to get worse when motor is warm. Can someone pleases help with some ideas. Thanks in advance

Does black smoke come out the tailpipe while it's running poor?
How easy does it start warm?
Does the motor oil smell like raw gasoline?