Need help!

Todd36

New Member
Apr 11, 2021
1
0
1
Blanchard
I have a 98 mustang gt, I had a 91 tune added I also had my car filled up with 10% ethanol 91 octane fuel, when I got the 91 tune.. now my car doesn’t run right when I fill up with 100% 91. It’s consistent but I can restart my car an it clears out an will run better. But doesn’t take long for it to start again. It’s also only throwing codes with 100% 91. P0174 an p0171. I can put 91 with 10% an car will run better.
 
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