The "air in the gastank" may have been an innaccurate way to explain the problem, but the fix is correct for the problem. If the gascap isn't on tight enough, pressure problems result in the tank. This can cause your auto to change various settings in the emissions control systems. End result: your car runs like crap because your cap is bad or you didn't screw it on tight enough.
In terms more clear to Joe-owner: air in the gastank.
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