Audi A3 1998 - Unresolved rattle - TT Lady

My Audi has developed an undiagnosed loud rattle underneath, mid way; the engine and exhaust are OK. It disappears going up hill, and gets worse going down hill and even worse when depressing the clutch. Any ideas anyone please?

Audi A3 1998 - Unresolved rattle - Peter D

You do not mention what engine it is and whether the rattle is there at idle. Has anyone checked the Dual Mass Flywheel. Regards Peter