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.

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.

dealer fixed at no charge.

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.

Is there any way this can be fixed without replacing the part?

The % of ethanol reading in fuel increases with every fill up.( Using strictly Exxon 87 octane...) As a result the ECU adds more fuel until the Long Term Fuel trim reaches it's correction limit, then I get a MIL , code P0172, and troubles starting the engine( longer then usual crank and detonation) Dealer reset the parameter...charges $ 60 and after a moth or about 4 fill ups....BACK TO THE SAME..

po172 code for rich bank 1, fuel alcohol content reads 50.5 percent?

I fueled with flex after having used regular gas for a long time. On way home from work on the freeway at rush hour car slowed abruptly to 40 mph from 70 mph. Warnings appeared: engine power reduced. Service stabilitrac. Service traction control. Took to dealer. I now have to pay over $1200.00 on a car with not even 60 k on it as this is somehow not covered under powertrain warranty. Unacceptable. Will NEVER buy Chevrolet again.

Threw system rich DTC with 30% negative fue trim and showed 49% alcohol. Never used e85. Commanded fuel comp relearn and fuel trim returned to normal with 3% alcohol.

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?