One tooth off can make the SOHC cars run oddly for sure. But the fix is more than a 30 min affair. Wheel, crank pulley, one engine mount, both timing covers, and the belt tensioner and belt have to come off to adust it. I id the job successfully last summer. For me, inexperienced, it took a long time, but even the experienced will need a couple or a few hours. Be sure this is the issue first by eliminating simpler possibilities first, I'd say.
EDIT: suspect the fuel system maybe too... you had cruddy air filter... how about fuel filter?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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