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99 A4 2.8L quattro - 150k miles. Water pump freezes up. Ireplaced the water pump with a remanufactured unit per the Chiltons instructionsincludinginstalling a new timing belt (without the spec tools).The engine started on first test and ran great but just a hair rough on idel. further examination isone cam sprocket is off 1 tooth.99 A4 2.8L quattro - 150k miles. Water pump freezes up. Ireplaced the water pump with a remanufactured unit per the Chiltons instructionsincludinginstalling a new timing belt (without the spec tools).The engine started on first test and ran great but just a hair rough on idel. further examination isone cam sprocket is off 1 tooth.