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Verify that the fuel pressure coming from the electric fuel pump is at least 34 PSI. If it is not, the ump will need to be cleaned or replaced. Also ensure that you are firing on all 6 cylinders. If you are not, swap the coils and see if the spark will follow that coil or remain on one cylinder. If it follows, replace the bad coil. It it remains on the same cylinder, you will need to test the input.
Yes, the electric fuel pump. There is a test point at it that you need a gauge to screw onto the valve. It looks like a car tire valve stem.