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At idle have exhaust fumes coming thru aircondition system on 2004 Lincoln LS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Was told it was the PVC hosing on top of engine...replaced...after 2 weeks same problem. Was also told the head gasket was NOT leaking. Smells like oil burning!
(1) Answer
Check for oil leaking onto the exhaust system. Check the valve cover gaskets, as these are right above the exhaust manifolds