While driving truck, it will go into neutral like state.

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Several times in the past week the truck will go into a neutral like state, slowing down and finally catch again or not catch at all and I will have to pull over, turn the engine off, wait and few minutes and try again. The check engine light sometimes comes on and sometimes it doesn't. It is currently on now but our obdii only reads 8888. Mileage is 130,031. RPM will go high to 2500 but goes down if it catches again.