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84kq vacuum hose problem?

The vacuum hose on my 4kq is collapsing on idle. It is the hose that goes from
the intake manifold center left, looking back, and then connect to the idle
regulator? I think. Off idle it looks normal and the car runs fine.

I have an 86 Coupe with the same setup and the hose does not collapse. Could
this be due to the older hose weakening or is this inherent to another
problem. I have traced out all the vacuum lines and cleaned up some of the
older ends so it all seem  tight. 

Any thoughts.