engine wont rev passed 2.5 then it does then doesnt...

[MT325is]

Alright... So I'm driving today and everything is good again.. Then out of the blue the car dies. Wtf right?
Start it back up.. Now it won't rev past 2.5 k... So I pull off. Check all connections everything good. Hmmm try revving it.. Still won't go.. Disconnect the o2 still nothing new. I turn around to drive it home. And ohh finally revs past 2.5 but rough revs ... Then cuts out high revs again;( so I get home look underneath,. An there is exhaust leaking near the cat..
Do I'm thinking clogged cat? If you guys wanna see a video I made one..
*it also ended up sounding like maybe a back fire a couple times...

2 weeks ago my o2 went bad, i resealed the engine mmm 2 months ago, fixed vaccum leaks about 2 weeks ago also..

[MT325is]

Bump..

[kid325e]

Check the C191 Conector. It sits under the intake Manifold for a quick disconnection from the rest of the engine harness. It's prone to corrosion from oil, and coolant leaking onto it from the Intake Mani. Worth a shot, pull them apart and take a look inside!

[MT325is]

i will take a look right now, and i took the exhaust off.. no difference... so it can go back on..

[MT325is]

All the connections are dry...