[Vinny]

I had the same problem and also looked for "big things" to be wrong. After hours of checking everything dozen of times and putting multiple ECU's on plus changing coils.......it was a wire getting pushed out enough to not touch the ECU when plugging the main harness connection to the ECU under the gas tank. I think it was #19 wire and it tells the ECU that you have a good ground.
Make sure the wires don't get pushed out by watching very closely when you plug the wires to the ECU ( easier to see when not connected to the gas tank)