Misfire Cylinder 1 & Large Vacuum Sucking sound when shutting engine off

What is your question?

A couple days ago I got a code P0301 while driving, I hit the gas and when I came off of it, the engine started misfiring. When I got home, I switched the places of the ignition coils for cylinder one and two and it started working fine. A few days later, the misfire came back so I switched coils for cylinders two and three and the misfire persisted. The spark plugs are fine and aren’t deposit fouled. I’ve ordered new coils to put on along with new plugs just in case, but I changed the Plenum gaskets and that hasn’t solved the problem either. When I shut off the engine, there is a loud vacuum sucking sound coming from the middle of the engine bay. This has been happening ever since I powered the engine on without the air intake tube connected to check throttle body functionality, I am 100% certain nothing flew into it, what is causing these problems?

How long has your 2016 Dodge Charger had this problem?

A few Days