Get it tuned for 91 fuel and never use 100 again, as I and WW have said. It is just craziness to use that kind of fuel in an engine not built for the racetrack. You don't have to be a math genius to see that the leap from 91 to 100 is much higher than even the jump from 87 to 91, and the stock ECU can't even tune itself for that small difference.

Does Richard know you are mixing up these fuel cocktails? If you are changing the grade of gas you are using, then Dyno-Comp might be totally blameless in this whole scenario; you are confusing the CRAP out of the stock ECU by being inconsistent with your fuel grade, especially if he has tuned it close to the limit for 91-octane fuel.

 

i stopped using one hundred i went to dyno comp and he said i had a sparkplug gappege. he was the one that told me to use 100. he said like once a week to put about 3 gallons of 100 in to keep it running clean. but he tuned at 91 and he fixed the sparkplug and i think the lean is gone but when i get on it in between 5000 and 6000 the timing is off just a little. he put it on the dyno and he said that there is a little bit a a timing issue but it could be from the gas out here. in between those rpms there is a little hesitation but other than that is runs better. thanks for all the help any morte suggestions please tell me.