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V6 1990 engine idles fine up to 2800 rpm,surges after that. on 1990 Toyota 4Runner

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Replaced fuel pump,filter,and mass airflow sensor,scratching my head need answers soon.
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no light.This happened all of the sudden after filling up with good high test gas.truck ran fine before that.sorry to sound short but this prob is keeping me from a new job out of town.I'm a motorcycle tech that's why this bothers me,when I don't understand something.This is my first toyo,I'm a chevy guy. Help is much appreciated.
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