Quote Originally Posted by X97prixX View Post
Got an engine light, read the code says it's running lean. The only thing I can think is the gas I'm running. I ususally run 87 in Idaho and now I'm in washington with 91 with 10% ethenol in it. We don't have any gas in Eastern Idaho with ethenol in it so I'm thinking it's a contributing factor.

Also after a day of the light being on it went away.

Any Ideas?
Sounds like a fuel injector issue to me. I recommend dropping a can of SeaFoam in the gas tank. And do your self a big favor, if it runs lean again get it fixed ASAP. Lean engines can self destruct, so tread carefully.