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VVIS Butterfly Valve Screws - Beware

Just recently started to hear a rattle between 1500-2000 RPM on my 91 with 95K miles. I took it to Shad at Driving Ambition, and he suspected this could be the cause.

I stopped driving the car, and I will be removing the intake in a couple of days to take a look. I'll let you guys know what I find. In my opinion, this few hour inspection is a small price to pay to prevent engine failure.
 
I know this is an old thread but is this screw issue something we should all be looking at fixing or is it a very rare occurrence?
 
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