Q: Q: Catalytic converter issue?

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Yes, my car was driving fine without no problems, and later on when driving yesterday; my car strarted slowing down on it's own. Also making noise like it was something clogging my gas pipe. But after it stopped. Later on I went to start it up it would come on without a problem with no check engine light , it would start up just fine but shortly afterwards it would cut off on it's own again. I was wondering if it could be that it needs to be relearned? I need some help. Asap

My car has 116930 miles.
My car has an automatic transmission.

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