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F25LA 20hp with intermittent rough idle

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  • F25LA 20hp with intermittent rough idle

    My engine starts but idles rough. The engine will run rough and then suddenly the rpm increase and it runs smoothly, then rpm's drop again and runs rough. As i increase the speed the engine coughs and sputters and then suddenly kick in and runs smooth at a higher RPM. The rpm cycle back and forth ( rough to smooth idle) and sometimes kicks in and stays smooth ....but not for long.
    I have cleaned the carb ( removing all the jets and blown out the holes).... the carb is clean. The engine fuel filter is also clean as is the water separator.
    How do I fix this problem?
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