Vacuum to EGR Valve Problem

[drummerdude545]

Ok, so I have Toyota Camry 2000 V6 3L that recently shows a Check Engine Code that when hooked up to a scanner tells me that it is "EGR Flow Insufficient". The car idles rough and it hesitates when going to accelerate. I replaced the EGR valve in the car but the problem still exists. When I disconnect the vacuum line connected to the EGR the car now idles smoothly but the Engine light is still on. The whole vacuum system comes from the intake and goes to some sort of purple diaphragm that then connects to a solenoid with two wires and three vacuum lines,one which connects to the purple diaphragm, one which connects to the black type cylinder and then to the EGR Valve and the other line goes to the air box. I would assume that there is something obviously wrong with one of these three components and I am wondering how I would test this to diagnose which one needs to be replaced.