I have a 1995 Chevy Astro. I had an auto shop change the fuel injection spider. When I got it back, I noticed there was a screeching, grinding noise coming from around the intake manifold when I shut off the engine. I have a video here of the noise. https://youtu.be/KY3U9IqTA7Y . Much appreciated if you guys can diagnose it for me and tell me what the problem might be.
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