You need to start more formal testing of stuff. Do you have a service manual? The 1998 Civic's service manuals are freely available online if you search effectively. I have the 1400+ page 1996-1998 and 1996-2000 manuals in PDF form... got them free online. They have great trouble shooting charts.
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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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