I have an 89 XR7 with 70K on the car. The car is all original and I rarely drive the car. Today I took the car out and parked the car on my driveway that has an incline to it. When I turned the car off and put the car in gear to park the car, the car kind of inched forward a little bit. I also noticed that the car seemed to be slipping in gear while in park with the parking break off. When I put the parking brake on, I had no problems. I rarely drive this car but I was wondering if this sound like the clutch is slipping. I did take the car for a drive to see if it looked like the clutch was slipping and I did not notice a difference or jerking. This just seemed to happen on an inclined hill. Any thoughts related to this and if I will be in need for a new clutch.