| Heat produces vapour plugs in the fuel line. |
| Burnt gas plugs forming and remaining in the exhaust manifold following an overheat and thereby disturbing the exhaust. |
| Abrupt and abnormal enrichment of the fuel/air mixture following an inappropriate use of carburettor heat. |
| Water vapour plugs are formed in the intake fuel line following the condensation of water in fuel tanks which have not been drained for sometime. |
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