08 JK engine miss ,baffling.

08 JK, original owner 125K miles or close to it, Started out as a slight "bump" when idling, then went to a miss after warming up then backfired driving on freeway. After all of this it would not throw a code. Now it shows cylinder #5 . Removed spark plug and checked ohms,spark plug wire and checked ohms,(my method may be sketchy) ignition coil bank reads the same as a new one at the store. I have had 2 ignition coil banks fail so the JK is on the third one. Purchased a new code reader/diagnostic tool and not getting the results I need.

About to throw in the towel and send it to a shop but reluctant to do that.