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I have a 90 allante that runs rough until I loosen gas cap to let pressure of which seems like a whole lot of pressure, and it runs fine. I also hear a gurggly sound coming from the area of gas tank. Anybody had this problem?
I would look at the vapor canister hosing and/or the filter within it. There should be some pressure in the tank normally but releasing it should not affect running.
Also there was a recall on gas caps on some years of Allantes. The vent portion would stick.
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