well i have a 1994 b4c lt1 6speed 58mm tb, headers,catback,new opti, plugs wires... was on my way to work and I stopped at the stoplight and it was idling at like 500 rpms then died, no check engine light, and it started right back up, and did the same thing the next time i stopped, but if i gave it a little gas it wouldnt die then i got on the highway and drove to the other side of town and it was fine...
i think maybe fuel filter??? but idk

 

Vacuum leak or IAC failure?

 

If it has been over 25K since you changed the fuel filter, I would do it just to rule it out.