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/\/\ X2 they are just vaccum lines the one off the fp0r runs to your map sensor, the one going into the plenum goes into the engine harness. Just grab them by the boot and pull harder, can also get a small screwdriver and kind off push on the end of the boot while you pull.. if they are hard to get back on just use a little penetrating oil.
what are you trying to do by the way?
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