In a lesson in buyer beware, I bought a 4 bolt axle setup from someone on here, it's had quite a few issues, including side cover damage. But, this thread isn't about that...I went to clean up the axles and start to replace the boots when I noticed one outer cup and the axle end that mates to...

Hoping to make sure I'm looking in the right places to diagnose this issue, any suggestions appreciated.Issue: At warm idle the motor almost feels like it is stumbling. From the engine bay it sounds ok (no loud noises or vibrations), but the vibration in the cabin feels really rough. Even with...