Ummmm...Quote "...the air filter was soaked with oil i guess". Impossible to have the AOS contaminate the air filter, the AOS vents into the intake manifold. My $.02, you say you had the engine changed out because of an obvious cracked head or block. Go back and question the ones that swapped out your engine, I'm sure it wasn't cheap.
CEL's, AOS and ignition problems? I'd be camping on their doorstep. Good luck.
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Sadly on the outside looking in.
"Drive it like the Doctor ordered"
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