just my experience, and I don't have F.I
I pumped gas at a very rural area's gas station, after filling up to the full tank,
my car was jerking very bad. fuel cut at 4700 rpm, and anything after 2500rpm, my car loses power and goes really slow.
If I give a full throttle, it jerked like I was riding a horse.
After using all the gas in the tank, I filled up fresh gas with octane booster, my car became normal.
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