If the car is dieing at 70 MPH, chances are it's not a vacuum hose. When it dies, is it all at once or does it feel like it's starving for fuel. If it's all at once, it's most likely electrical. Otherwise, you may want to have the fuelpump pressure tested.
As far as the engine dieing at an idle, that could be caused by a vacuum hose.
Let me know what you find or if you have any other questions.
Wednesday, November 12th, 2008 AT 7:43 PM