Q: As I was getting on the interstate, my RPM's jumped to 5 and my car started jerking but never died. I built speed back up to about

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As I was getting on the interstate, my RPM's jumped to 5 and my car started jerking but never died. I built speed back up to about 60 and it drove fine for a couple miles, then did same thing again. This happened 4 times in about 10 miles. When I got to my mom's, I shut my car off for about 10 minutes. Then, I drove back roads on my 30 minute drive back home w/ no issues. I stopped at Advance Auto to get my codes read. I received a code for Catalyst System not running efficiently and one for Idle Air Control System-RPM's higher than expected. Any ideas?

My car has 147000 miles.
My car has an automatic transmission.

You should check the transmission fluid level and smell the fluid to see if it smells burnt. The problem sounds like you have a transmission that is slipping and should have a mechanic like one from YourMechanic check the vehicle to see if it is a transmission or engine running problem. If you have an exhaust system that is getting blocked by a bad catalyst can also cause loss of power. You did not indicate the vehicle you have so all of this is general causes. A mechanic can check it and diagnose it in person to isolate the actual cause for you.

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