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disclaimer:
i am not familiar with your car, this is general advice based off of observations of tons of yota carbs across a bunch of years.
toyota sets the mixture at the factory, and on most carbs you have to drill out a plug to adjust it.
it is way more likely that you have a malfunctioning emissions system then the carb needs adjustment.
i would check ALL vacuum lines for cracks/stiffness/ or being plugged. if you havent changed the vac lines yourself or had it done in the last couple years i would do that. just do one line at a time so as to not get confused.
best of luck , wish i could help more.
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