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I would not think the crank sensor is your problem. That's magnetic and oil will not affect it. Besides, the crank sensor would cause a problem at any speed and usually will completely stop the engine and make for occassional not starts.
It sounds like you have been checking things out fairly good, but have you checked all your vacuum lines for leaks, as well has the intake hoses? Sounds like an issue with not getting proper fuel/air ratio at higher speeds. So starving for air due to leak or low fuel pressure. If the fuel filter has not been changed in quite a while, might want to consider that.
I'm sure others with more 240 experience will have more info.
Gary
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