Help, really bad knocking under pedals in last 50 miles, goes away under acceleration

S-Liner

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Hi all,
Ive got an A4 avant 2.0TFSI, its developed a really bad knocking underneath the pedals thats got really bad in just the last 50 miles. It sounds like a chinook. Theres a bit of wobble on the steering wheel but not excessive. The knocking goes away under acceleration. any ideas? CV joint? Driveshaft?