EXACTLY! the same here mate,I did all that 02 sensor,map sensor,adjusted FITV and more.
Everything I did improved the car.Now,problems = 0.
I know now what a 'tight knit' little engine honda's are i.e. When 1 sensor/thing fails or begins not work 100%,the problem shows itself as a random little annoying issue that becomes a problem and it's impossible to pin point it.Best to fix/replace everything 1 at a time,starting with the most common to least common.
Do this until your engine is 100%.
Most things don't cost a dollar,other's do cost money.
I recommend changing the 02 sensor,yes they do make a difference and can cause surging hesitation in honda's.
Never expect an 02 sensor to last 100,000k's,but they can! But they can easily not be operating at 100% anyways,therefore it can be sending incorrect data to the ecu and your air/fuel mix is incorrect.The ECU simply adds more fuel to compensate.Very common I believe from my experience.
Your air/fuel mix is everything.
Anyways I did EVERYTHING and my car runs 100%,I'm on top of it!! I know what's going on with my car and that means everything.
So get in there and learn mate!
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