Tuppidsay

Just got an excellent deal on a 98 A4 Quattro 2.8 5-speed. Wasn't able to drive the car when i purchased it due to a failed water pump (leaking) and a misfire (injector) Now that I have been driving the car for a few days I've noticed some issues with the clutch. First and foremost I have no problems engaging or disengaging the clutch to shift gears, no slipping, chattering, good pedal feel throughout it's travel. At any time when the engine is under about 1700 rpms there is a strong constant vibration in the clutch pedal ie, driving, stopped, in gear, out of gear, clutch in or out. When I press the clutch in I get a groaning or moaning noise. Kinda sounds like a old ford power steering pump with the wheel turned all the way to lock. Not a high pitched whirling/squeeking like a throw out bearing usually makes when they are going out. Any ideas?