I took my 2004 Discovery II (84,000 miles) to the dealer to have a Valve Cover Gasket job done. Soon after leaving the dealer, I received a call from the advisor telling me that the car was leaking antifreeze and oil, thereby needed Head Gasket also. Expensive, but I authorized the repairs. Within 3 days, he called me to tell me that the car was ready. I went to pick it up. While driving back on my way home, I noticed that not only the idle was high and the car was shaking considerably at stop lights, but also the engine was knocking. I have to say that beside the valve Cover that was leaking, the car was running smoothly prior to the big repairs.

When I took the car back to the dealer, the advisor told me that it was normal for these model years to be rough. I know that his claims are false. But I would like your advice on this.