P301 code, rough idle with some power loss on acceleration blinking CEL plz help

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The items i have changes this far are as follows: fuel filter air filter plugs gaped .028-.032 plug wires coil 4 fuel injectors TPS Crank Shaft Sensor Timing belt and bearings I not only have changed all of this I have searched diligently for vacuum leaks, and or broken wires, etc I am at a complete loss and running out of money. If anyone can give me some good advise it would be grateful.