I recently moved from Florida to oklahoma and had to start using octane 91 from previous 93. I always had to use a premium fuel to keep from detonation. When I shut the ignition off, the car tries to restart. Most of the time it will shut off on its but others I would have to turn the switch back on and the car will run. When I was in Florida and as long as I used 93 it hardly ever happen but now since I have to use 91 here in oklahoma it has started back to do it a lot. How can I fix this from happening, it's embarrassing when out in public and this happens? Is this detonation? Any help would be greatly appreciated.
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