my 1993 chevy camaro z28 is starting roughly and at times dies out at stops do you know what might be causing it?

How is your charging system? If the alternator is not charging enough it can die at a stop. Did you replace the distributor cap and plugs and wires along with the rotor? How about the sensors in the engine, your Mass Air sensor or another sensor could be a culprit.

No MAF on 93, uses speed density. Sounds like the dreaded Optispark, but check out the plugs and wires first.

I have the same trouble with my '93, The car has SO Many Sensor's on it, plus it's an old car. I would Clean the air-Box, use at least 89 octane, change the Fuel filter to, its located under the passenger side I think, looks like a soda can. If None of these work, and your Engine light isn't on, Gut the Cat. When I got my '93 of an older guy, I could tell he didn't beat on it, so when I Romped it, all the built up carbon, clogged the cat, an the car wouldn't even start. Only gut it as a last resort, since the OE replacement is like 700$... ~scott