Car is my '94 Z/28 I have listed in my sig. Have changed: ignition coil, plugs/wires, opti cap, fuel pump, and fuel filter. Car idles ok until it gets into closed loop, from there it idles rough and if I try to get on the throttle at all it doesn't wanna get too far past 2 grand and it backfires right about when it does. The fact that the car only wants to act up in closed loop leads me to believe I have an issue with my o2s. What do you guys think? Any help is greatly appreciated, tia.

 

You can check the O2's and see if they are functionang properly with some scanning devices.