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Is the idle speed floating? Many people have known for a long time that if the engine speed starts to float, it means that one or more sensors start to work incorrectly or the power unit starts to be affected by external, unfavorable factors. Reasons why the engine speed starts to float: Air leak. Weak ground contact on the ECU. Dirty throttle valve. Faulty MAF. Clogged IAC. Worn injectors. Clogged spark plugs and ignition coils.