1994 Chevy Suburban Cutting Out

Within the last year, I have replaced my exhaust system with Holly headers and Flowmaster exhaust. After a short period of time, my vehicle began cutting out and running real rough. I have changed plugs, wires, fuel filter, ignition control module and cap and rotor. I have also added a couple of comp. Chips for HP and fuel mileage. The one wired into the O2 sensor burned out and melted so I rewired to stock, but the one on the MAF is still attached and can be adjusted for max or min power. Still nothing. If I baby it, it still runs rough. When I get irritated and romp on it, it will hesitate and backfire then get up and go. I'm at my wits end. Could you please give me some advice. Thank you.