Trouble with my JB4 tune

[Rusjackson]

I have a 2018 Stinger GT2 with new plugs, exhaust, and JB4 tune. I filled the car up with half E85 and half 93 octane. The tune is at map 5 and will work for a little but then back fires and shoots codes for not enough fuel and to much air. Goes into limp mode and the tune shuts down. Check Engine light is on now. Anyone have these issues

 

[Terry@BMS]

JB4 log? Maybe map5 is too strong for your car and causing fuel pressure to crash? How does it run on map3?

 

[AWDGT2]

You basically mixed E47 or more. No bueno and the car is going to complain. You need either an ethanol tester, an ethanol calculator, or a fuel it sensor. Don't do that again, LOL
Start with E27-E30, in Map1, then Map2 ect and post for evaluation. Going Map5 with too much E isn't worth looking at, we know the issue.

 

[StingertimeNC]

yes, I think at most you need 4 - 4.5 gallons of E85 and the rest 93. Tester is the only way to know for sure because E85 may not actually be E85.