What is the hose of the left side of the distributor on a 91 chevy astro van?

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The hose is broke on my astro van and I don't know what it is or what its connected to so I can replace it. I can't find a diagram or any info on this. The van stopped running over a month ago and I replaced the fuel pump and ignition module and noticed the hose. It isn't tore, it is just in half.