Engine "pops" at idle after true duals

[Trippyjoey]

So I wasn't happy with the flowmaster it had so I went with true dual glasspacks (had the glasspacks lying around from a gift). The engine wasn't stuttering till right after I got the true duals done. It stutters when cold once it warms up it goes away also a backfire like sounding pop that changes between the left and right side. I've heard many of these trucks require a heated oxygen sensor after such install so tomorrow after work I'm gonna get under the truck again to check if it's a 2/3wire O2 sensor or a single wire sensor before buying one.

Anything else I should look for or check while I'm at it.
I haven't lost a power or any other noises just the engine seems to stutter and I get a pop until it warms up. I really want to get this fixed because I'm planning on installing a wet N2O with a 50hp-75hp shot that I got lying around.
Engine is a 95 350 TBI stock other than the exhaust with 191k miles, automatic 4l60E 4x4. The truck is a GMC Yukon 2 door.

 

[Gzes]

Can tell you tbi and nos no good. Probably o2 related but j think its a 3 wire. I need to do mine but when I'm doing ny headers I'll do it

 

[RI95Tahoe]

When switching to true duels, do you run 2 O2 sensors (1 on each bank) or just a single? Have to do a exhaust on my 95 and was thinking doing a true duel.

 

[Trippyjoey]

When switching to true duels, do you run 2 O2 sensors (1 on each bank) or just a single? Have to do a exhaust on my 95 and was thinking doing a true duel.

As far as I know only one is needed as long as it's kept the right distance so it gets heated to the right temperature if not it must be swapped for a heated sensor. I checked mine today and it was a 3 wire setup.
I unplugged it then plugged it back up and it ran better but after turning it off an letting it cool it started acting up again, tomorrow I'm gonna get under it with a multimeter to test it.

 

[Trippyjoey]

Okay I seafoamed the engine and unplugged the O2 sensor and plugged it back in and it ran great no popping or anything braking felt firmer since their was more vacuum but once I turned off the engine and let it cool it did it again just not as bad. I did find an exhaust leak thanks to the seafoam so I'll try to fix that since it's the gasket connecting the manifolds to my exhaust.