engine stumbles and hesitates once in a while but no check engine light or any codes? Also has a smell like exhaust or oil. checked levels and recent oil change. Person says possible ignition coil?

Hello, if you have no check engine light and no failure codes - even pending - then I would look for more of a fuel and air mixture concern than an ignition concern. Spark plugs and coils and misfires related to these components are pretty transparent in diagnostics and usually show up. Air and fuel issues sometimes may not. I'd be ensuring you have no vacuum leaks, no air intake restrictions, all factory equipment installed and no mass air flow leaks. Hands on testing by a pro is highly suggested. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops