I currently own a 2010 accord coupe v6 and it seems I've been having so many problems with this car..

I first noticed when I would brake and as my speed would drop at 40km/h the car would for a split second jolt/shake, like the transmission is not downshifting smoothly.. than after awhile it started to jolt exactly the same but now when I would accelerate and hit 40km/h exactly

Now, recently I started to notice a loss of power when pressing down on the gas, acceleration is just what it use to be it seems.

It gets worse, a few days ago I went to Mr lube for an oil change and fuel system cleaner, I left the shop fine but two hours later my engine light came on. I went back and they told me you have to drive it off and the light should go off in a few days, and to come back if its still on.. well its been three days and still hasn't turned off..when they read the code it was p0420, which is a failing cat. Converter from what I read online...so a bunch of problems it seems with this car not sure what to do!

 

2010... go to the dealer.