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74tii Vacumme Leak/Unstable idle

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I think I found the culprit in my 74tii. I have a leak in my intake from one of the top ports that was covered with a red cap. Is anyone out there using something other that the red plastic cap with a clamp? This is what the PO had installed on my car.

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since the tube is brass. If you want the closure reversible, use a machine screw that can be forced down the tube, and wrap with a bit of Teflon tape.

Works for me


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