How to diagnose bad engine mounts: If you are experiencing shaking, thudding, clunking or vibration when shifting your vehicle into reverse or drive, or when sitting at a stop light, or hitting the gas, you might have worn out engine mounts! In this video, Andy explains why and how engine mounts wear out, and shows you what it looks like, and how to determine if you need to replace the engine or transmission mounts on your vehicle! | 1A Auto Parts