OEM. Original to the truck AFAIK so 27 years old.
I've seen similar stuff of varying viscosity, this stuff was very loose and wobbly though.
This is how it looked when I opened it up. I think the stuff got so soft it flowed down into the vavcuum port like I mentioned and seemed to plug it up.
Sometimes this MAP would work, other times it would randomly lock in the middle of the voltage range and KPA on the scanner.
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