4000Q Stalls when I let off the gas

[AUDIJIM at aol.com]

Look at the vacuum hose that connects to the ISV. While the engine is 
running, they tend to collapse due to the vacuum suction. Over time, it will generate 
a vacuum leak. You can usually find it split on the side you can't see. The 
crack/split will be facing the intake manifold. The part number for that vacuum 
hose is 034 133 997. This has happened to me before on my 87' 4000cs Q. I 
have since eliminated the rubber vacuum hose for one I made out of stainless 
steel tubing. No more collapsed vacuum hose!

Jim