Hoping someone has some advice. The car has been driving fine, no warnings or anything. Today it started making a vibrating sound which seems to be coming from the engine. It's puzzling as it only makes the noise when I lift off the accelerator. It doesn't do it when idling, when depressing the clutch and the noise isn't there if I have my foot on the accelerator. It is only when in gear and coasting (like when I was going downhill and lifted off). It's worrying me as I have a 360 mile journey to do in a few days as we're moving home! I would be so grateful for any advice. Thank you.