Chevrolet Repair: 2000 Chevy Silverado 1500, chevy silverado, fuel filter

Question
I have a 2000 Chevy Silverado 1500 with a 4.3 engine. It has been jerking like it is loosing fuel supply. It also just loses all power, like it will still be running but losing speed with the accelerator all the way to the floor. It is also shutting off and not starting back up for a while, but there are no lights on. I have changed the fuel pump, the fuel filter, and the plugs and wires, and it has done nothing for it. I'm just lost on what else it can be that wouldn't throw a light. Can you help me?
                       Thanks,
                            Kevin

Answer
Hi Kevin, The only thing that comes to my mind is maybe you have a plugged cat con. I would open the exhaust system and road test to see if it makes any difference. The best place to open is right at the manifold.

       Let me know what happens            Mark