Simply raising the EGR valve with your finger isn't enough to verify proper operation of the system. Jack the car up so the rear wheels are off the ground using a lift or jack stands. put the car in gear while working the throttle gently accelerating & check to see if the EGR valve responds. If so then the system is working if not as I suspect it isn't figuring out why can be tricky as there is a vacuum transducer, switches & vacuum lines that could be at fault. The hot air cars are really bad for this good luck trying to find parts. The other problem lies with the park/neutral feature that has to work correctly to tell the computer that the car is in gear to enable the system to work. Using a scan tool to verify that.Incidentally the speed sensor also has to detect that the car is in motion assuming the the speedo itself works. If that all checks out then the cat convertor is the next place to look.