let me ask something simple, that nobody else has. do you have a check engine light on the dash lit up? if so, have autozone pull the codes and see whats going on. THEN fix the problem rather than grasp at straws.
its possible that you have a bad engine mount, shitty spark plugs, maybe buy gas at a shitty station, have a vacuum leak, or several other potential issues. I'd start simple though and evaluate the condition of the vac lines.
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