Q: injectors only spray 3 times and quit.

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Truck ran fine when we parked it,, went to start the next day, it fires, runs for a second and dies. injectors only flash with test light 2-3 times. engine light not on, and no codes found. have tried changing ECM with one from salvage yard but no change. any ideas?

My car has 186000 miles.
My car has an automatic transmission.

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