Changed eng due to blown head gasket, now I keep getting check engine light.

This past April I had my head gasket blow on my 2013 prius gen 3. They put in new engine and said I'd probably need new Cat which was $1800. I had some eng codes come on and changed the MAF, MAP sensors, both O2 sensors, spark plugs & now my catalytic converter. I still can't get rid of 2 of the codes, P0172 & P219A codes. It runs rough if I hold gas to stay just above the ECO mark on my dash. The exhaust smells strong but not like sulfar but more rich. What else can I change that I haven't already? Should I try the injectors?

 

I have changed the large gasket and the small Oring is there and didn't see anything wrong with it. I usually get the 219a code after driving about 30 miles. At speed it gets rough when I back off the gas