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I suggest sourcing the hoses then bench test the ICV. If the hoses are hardened up its also likely there is a big hole in a spot you cant' see. It might cause thing like the motor mounts to degrade if it's barfing up crankcase fumes. the hoses might be radically different in price depending on the source, Ive never found a very complete rubber kit for the whole car but I'd look around, You may find silicone hose kits. some do the smoke test to look for leaks, that might be a good idea too.
my 88 ford van has a similar issue i think the ECU isn't sensing the temp correctly so it stalls thinking it's warm when it isn't. When warm it's fine, I know its all different but I got similar advice to clean the throttle plate area for that vehicle.
what I did was ordered about 10 feet of some various fairly heavy duty rubber fuel hose sizes, I figure I can check when I get in there and if they fit , great and if not then I can look for metric sizes. I dont mind having a little selection. I figure the heavier fuel rated hoses are going to be ok for vacuum, might be a bit thicker walled. the hose and fitting retailer said something about "fuel hoses for marine applications"..
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