Help! New 3" Cat./Won't Idle Smooth

[1BADSUV]

I just did the Conrad Cap/Rotor, AC Delco Plug's, wire's, and ignition module. I have been driving the Typhoon without and catalytic converter and decided to add one. I originally was pulling a code 42/43, but fixed that. The exhaust is making a light burping sound, if that will help with diagnosing the problem. I also checked the vacuum hoses and they seem to be fine, the truck has 83k on the odometer. Does anyone think it might be the O2 sensor? The truck is not pulling any code's.

Joel

 

[V6 Kompressor]

Sometimes when a muffler shop welds on the exhaust system, a voltage spike from the welding can zap the o2 sensor... especially if they did not unplug the sensor before installing the cat....