Strange throttle closure in 2nd gear

[SHOwoosh]

Throttle closing in 2nd even though foot is to the floor. will say this is the first log I've done since going to an e20 mix. was going to log for torrie but it did this all 3 times I tried. Any ideas before I shoot torrie an email or could it be mix related. log attached

[StealBlueSho]

@ time stamp 973.453 your short term fuel trim + long term fuel trim is at +26% increase in fuel.. you are maxing out on your trims and your AFR starts to climb past .90 lambda. Since you don't have enough fuel to keep the target lambda (this is called lambse) your throttle is closing up to keep your engine from blowing up. Torrie will see this and make adjustments.

Also, from experience, don't start mixing in 20% Ethanol without your tune being adjusted for it... it plays havoc on your fueling.

[SHOdded]

Always check what the fuel fill cap says.  If you go past Exx without an appropriate tune, the pcm likely cannot adjust for it correctly without a custom tune.

[SHOwoosh]

@ time stamp 973.453 your short term fuel trim + long term fuel trim is at +26% increase in fuel.. you are maxing out on your trims and your AFR starts to climb past .90 lambda. Since you don't have enough fuel to keep the target lambda (this is called lambse) your throttle is closing up to keep your engine from blowing up. Torrie will see this and make adjustments.

Also, from experience, don't start mixing in 20% Ethanol without your tune being adjusted for it... it plays havoc on your fueling.

thanks for the replies just sent torrie a email