I converted my 2018 5.3 Silverado to E85 with a Kit that has the E85 sensor did the programmining with the HPtuner like this Youtube https://www.youtube.com/watch?v=O_WeWK06zWM filled it with E85 drove it all day and it ran great but then the engin light came on. I have not hooked up a scanner yet to look at the code. Any help on what may be wrong or point me to a good tune would help. Thanks in advance for the help. I Have a HPtuner and the credits.