Filters too. Check fuel and air filters for clogging. ...but I like the O2 sensor for air infiltration from that crack screwing with the ECU.
Maintain and repair the most obvious first... then move on to less obvious... you'll find it.
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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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