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If your engine is getting hot or right at the border line, that can cause this sort of issue when the engine is shut off. There is a heat soak period on the engine where the block casts off all of its heat into the cowling. One thing that you can try is to allow the engine to idle for a few minutes before shutting it off to try and get the temp down, or remove the engine cowling when you shut it down. If neither of these help, you would need to look at the pulse pump on the engine and also do a compression test to ensure that the block is not damaged.