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When you changed the plugs did you change the Coils ?
my thoughs exactly how can a fuel pump run bad then fix it's self. im still thinking its the temp sensor.Seems to me if it was the fuel pump it would run worse after it warmed up as the pump would be getting warmer as it is being used.Usually the pump is good if the car starts and drives. Seems like the temp sensor might be a good place to start and certainly will be cheaper than a pump, and easier to change. just my 2 cents worth.