Make sure its full of fluid. No vacum leaks and if yours has the switch in the D zone of the shifter, clean it with some contact cleaner and move the shifter side to side. Your car should have the 722.5 which can cause some diagnostic headaches but, is generally a solid unit.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.