load up, backfire right side, brains needed

[SEEEEYA]

I really have no idea why this is still happening, have hi-flos and a cat back on it, started to load up in 3rd gear, back fire, got a CEL po152 front bank O2 switched it out, put a roe racing tune on the car and it ran better until today, today went out fine, ran on Highway, up to 100, cruised awhile and fine. Got off highway sat at light for about 3 min.Left light and it started to load up, cruising in 3rd it starts to bog out, pull another gear, rev it a little, it back fires out the right side. So Now I proceeded to try and limp home, stopped at the light idles nice but I could barely get it to go in 1st, loaded up real bad, even my 13 year old said "oh ****", could not even cruise in the sub in 1st without it popping out the right side, NO CEL at all, never dropped a cylinder to know what it feels like but right now waiting for it to cool to check for loose wires, I just cant figure it out, thought I had it licked with the tune. DOES ANYONE HAVE A CLUE?!?!?!?!

 

[ssjcreeper]

Last year I had a wire that got loose and dropped on the header. At the time the symptom was rough idle and it took more throttle to get moving off idle, but there was no backfire or bogging. My first thought reading your post was bad cat(s). Were either of your sidesills hotter than usual?

 

[ViperGeorge]

Clogged Cat? High flows are known to do that.

 

[SEEEEYA]

did not check the sills for heat but they only have maybe 500 miles on them, everything happened after I got off the highway, you think a clogged cat would be most noticeable there?