Never ASSUME the egr tube is blocked until you do a simple flow test..EGR on 104.992 engines had a factory TSB change-out for Sticking EGR shaft and a new modified EGR with a larger shaft clearence solved the problem.
Pull a vac at egr activation port w/hand pump while car is at idle..if engine attemps to stall/rough running, you do not have a blockage at he tube. If the tube is blocked , then hand activation of the EGR will result in very little engine rpm change. [ b/c the blockage stops the air from open egr being sucked in, not allowing a lean condition..