Update.... Replaced ECU with a functional replacement from the exact same year and type, no difference the vehicle is still firing on only four cylinders instead of 6??? Based on the amount of replys, I guess I am not the only one who is stumped

The next step will be to try and change out the Crank position sensor, even though it was just replaced about a year ago.... After that, as far as I know the only thing that is left is faulty wiring. Any imput would be appreciated, thanks in advanced.