2011 Carolla s

#1
My son has a 11’ carolla that one day the check engine light and the trac control light (center dash low position) came on and then lost power and was misfiring,Toyota wanted 3400 to replace head gasket or 3600 for newish motor? I brought it home and replaced head gasket for about 300 with all the extra gaskets,motor now runs great for several minutes then the same lights come on and runs rough, replaced engine temp sensor ,new plugs but now still does it and will reset for a minute if you turn off key and restart but comes right back,now the only code I’m getting is misfire on#4 even after that I switched coils??? Any ideas
 
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