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Great idea, I did replace the main feed line to the booster with a new rubber hose. It seems to be vacuum rated as when its holding vacuum I can still squeeze the line. I have not replaced the small line going to the idle up solenoid so was planning on removing that completely and installing a rubber cap on the fitting on the pump just to rule that out.@Rubiclone I had this same issue, ended up being a blockage in one of the lines. Rig up compressed air on the line that connects to the vac pump and see how it is coming out by the booster. Also make sure you are using vacuum rated rubber lines, you might have one that is collapsing under vacuum. Start with changing them all to new lines to rule that out.
Did you happen to run a vacuum gauge on your rig when you had that issue? Did it seem to build boost slowly like mine was showing?