Vacuum lines keep blowing off EGR Valve

Hmm, sounds like the check valve may be bad?? EGR should only get vac. if I remember correctally.
If you are refering to the 2 lines that go to the solenoid with a rubber connecter, just remove the connector that ties the 2 lines together and connect the lines right to the solenoid. Also check that the check valve actually stops boost from getting to the solenoid, should only let vacuum pass as mentioned earlier. HTH