Engine starts perfectly but suddenly stalls and doesn't rev up properly.

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this happens in the morning after running for 10 min or less, then suddenly the stalling starts. the engine runs smoothly when it is not rev up. When you rev the engine it stalls and when you stop reving the engine shuts. The stalling is like, there seems to be a mixture of water in the fuel, the fuel is not burning properly. The stalling disappears after reving for a few minuites and runs like nothing happened.