Just purchased 965 1992 with 128,000 miles on it for $2000. On first test drive it would shudder when transmission was locking up. It had sat on small used car dealers lot for a year so teh 1st thing I did was have the tranny filter and fluid changed. Most times it works fine except for repeated locking and unlocking in slow traffic. Occassionally whwn trying to stop the converter is reluctant to unlock and teh whole car shudders until it drops to 500 rpm when it finally unlocks. I read FAQs and prior posts. Have't read of anyone elses symptoms quite like this. Any ideas anyone?