So it ran poorly the entire winter? . . . hmmm. Not sure on that one . . .

I wonder if it would behove you to disconnect the battery so that the comp "forgets" and then have it relearn . . .

I honestly cannot see how 10% Ethenol would affect it that badly . . .

 

ZOMG gasohol!!!

It's only been around since.......errrr........the 70's

 

Almost sounds like you may have water in your gas tank.