Check Engine Light and/or Lack of Power Due ot Flex Fuel Calibration Error on Chevrolet Impala

I've recently had this issue! My car would not go over 25 mph over the interstate due to loss of engine power. The dealer had it over a week and couldn't find a problem. They suggested it was the E85 I had started using. STAY AWAY FROM E85!

Car start to make aa jerking and vacuum humming noise as if its going to cut off then it takes off. Sometimes it slows down while im driving and won't pick speed back up for a few seconds. It seem to do it when I first put gas in it or when its low on gas.

NOT FIXED. Computer does not communicate. After using E-85
my check engine light came on and reads loss of power. Help !!

My car would actually cut off while on the highway. I would have to pull over and wait about a minute and then restart it. I thought it needed a tune up so I got that done and the mechanic told me about some sensors, the accelerator petal, fuel injectors etc. and he fixed it. I have not had THAT problem since.

dealer fixed at no charge.

I have been doing exactly that, was using gasoline. when gas prices spiked to 3.95 a gal i switched to E85, which is much cheaper. then had to get gas again, because I wasn't close to a station with E85. I do drive multiple shorts trips every day.

Check engine light code0420 after filling up completely with E85/flex fuel.

I filled only half tank with E85 but my fuel gage started to read full after I drove more on it but when I started my car back up it read low fuel then I was on my way to the had station and it began to rise all the way back up to full and I put more E85 to be safe but the next day after driving around my check engine light popped on then the low fuel light then my car turned off from having no gas.

I have a 2013 Impala LT and I ran all my regular gas out and put E 85 in my gas tank now my check engine light is on and it's it starts up a little rough ass moves out but I do not lose any power does this have anything to do with E 85 gasoline?