I mixedsome 112 with 93 yesterday to get to 99.7 blended. I took the car out and everything was fine for about 10 minutes and I got on it pretty good. Then, I was driving and got caught behind somebody, left it at about 5500 in 2nd for maybe 5 seconds or so. Then, as soon as I got on the accelerator, engine pulled back and engine light went on. Checked and it was a misfire code. Car has 272s, cam gears, exaust with test, 255 fuel pump, and XEDE running 1++ base map for 93. Never thrown this code before. 6000 miles on spark plugs. I think it is probably just the spark plugs wearing out. Any other reason why running higher octane would cause this aside from the obvious? Thanks for any feedback.

 

was the 112 LEADED???????????????????????

 

Unleaded, of course

 

did you disconnect the neg batt cable to reset the ECU after adding the gas?