Problem seems to be resolved. If anyone can give some insight on this it would be appreciated.
I filled the tank up agin with Premium gas along with fuel injector cleaner. I drove the car 120 miles without stopping. At the end of this trip, I filled the gas up again (half a tank) with Premium. Note just before this last stop, the check engine light was still on and the car was still sputtering. I drove one more mile from the gas station to the house. By the time I got to the house, the check engine light went way. I then decided to run the car on the freeway again to see if the sputtering went away. Finally! As soon as I left the driveway, I was able to floor it without any hesitation; even on the freeway.
Final analysis is that once the check engine light goes away, the car runs normal. My guess is that the computer was the driving factor for the sputtering. I believe this because when I took it to the mechanic shop a week before, the car ran great as soon as the check engine light was reset. This time, the car reset the computer. I'm not sure if the selenoid or cleaning the Mass Air Filter was the driving factor. Maybe it was both.
If anyone has expereince with how the computer impacts performance it would be appreciated.
A pawn in this game of auto machanics