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Q: oil in air filter housing on 2007 Chevrolet Cobalt

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
motor run fine until exaust manifold cracked. after replacing check engine light came on. will not idle after warming up and collects oil in the air filter housing?
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