Vibration when let off gas

Noises are really hard to discern in an online forum. I'd say you need to have someone near you hear the noise -- someone with technical experience and expertise. It goes a long way. Perhaps someone at a shop near you can give you some advice without having to pay for testing? It's worth asking to take it step by step, and then if desired, you could have the shop work with you to repair it. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops