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My car has the Engine Lite On for the last couple of months. The power of the Car is a little less. Whenever I stop on a light or a stop Sign, i really have to push hard on the Gas to move.

These are the below Codes I get when I checked at Autozone

P0422 Main Catalyst below Threshold bank 1
P0304 Cylinder 4 Mis fire Detected


However whenever I use the top line Gas and reset the Code, the code does not come back. The code comes back whenever I use the middle or the Lowest level Gas


Can somebody recommend what I should be doing
 

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2015 Buick Verano "Leather Group", 2015 Kia Optima Hybrid
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