Slight surging at idle is also a symptom of a vacuum leak - these cars are too complicated to diagnose by symptom - you need data. If you get the slight throttle bounce when you come off drive, thats a pretty good indicator of a bad hose somewhere.

Robbie, you can pick up a used transmission for about $500 and swap it in. If you like the car that’s cheaper than a car payment and can give another 5 years in your XC