NEED HELP 9-7x Aero using cataclean

[AeroBlazer]

So my aero recently got the dreaded P0420 and my shop cleared the code and recommended using cataclean to try to save the converter and I followed the instructions like they said and after noticeably after getting to the 1/4 tank and using it and driving to the gas station a distance away as it said to do I felt brief pauses when accelerating and shaking and it seemed to stop for the most part once I filled up and drove home and seemed fine other then sounding like a jet and did a test drive yesterday and it seemed fine but did one today and noticed shaking and might have been one of the brief pauses and was wondering if this was a normal part of the cataclean actually working?
(In terms of knowledge I am just starting to get into cars and repair and presume the pauses and vibrations were from misfires)

Edit Forgot to add also there was no flashing check engine light or check engine light since they cleared it at the time of this post

 

[TollKeeper]

If you are having a "jet" sound out your tail pipe from the cats, than the cats are beyond saving.

I know, not the words you are wanting to hear, especially in NY where you have to buy specific cats to meet the communist requirements of the state.

A flashing check engine light COULD be a result of it as well. If there is to much back pressure for the exhaust to properly discharge from the cylinder and exhaust, than the stoichiometry could be way off in the combustion palace, creating a misfire.

In your case, I think you are going to have to fix one problem, to see if it corrects the other. I doubt it will, but weird things do happen in engine bays.

 

[AeroBlazer]

If you are having a "jet" sound out your tail pipe from the cats, than the cats are beyond saving.

I know, not the words you are wanting to hear, especially in NY where you have to buy specific cats to meet the communist requirements of the state.

A flashing check engine light COULD be a result of it as well. If there is to much back pressure for the exhaust to properly discharge from the cylinder and exhaust, than the stoichiometry could be way off in the combustion palace, creating a misfire.

In your case, I think you are going to have to fix one problem, to see if it corrects the other. I doubt it will, but weird things do happen in engine bays.

There is no flashing light at all
The jet sound was only after filling up with the cataclean and the initial drive

Communist Converter laws are stupid
Also kind of worrying about the engine since the lower block was rebuilt prior to purchase