Are you getting any code? It did sound pretty bad and first thing came to mind was the valves too. Also a bad ignition module would make it run really bad too but probably would t sound like that…
Find out where the valve job was done at. You wouldn’t be able to register car in California if it’s not done. Not certain about other states
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2013 FRS - JRSC CARB
"Use all of the track" they say
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