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Was trying to solve this issue when I had my auto.
I did the TPS, APP sensor, air filter, opened my intake manifold and cleaned out all the oil vapor recirculation gunk on the runners and the valves and redid my injector gaskets. It made a minimal difference, but overall still noticeable. I just chalked it up to a slight vacuum leak that i couldnt pinpoint and/or shitty DBW tuning from honda. Does your engine rev up like 500 rpm sometimes in neutral and take a long time to go back to normal? (1.5+ seconds), do you also notice a lot of rev hang? I was super adamant to solve this issue and never fully solved it before I wrecked my auto tsx. I have a 6spd now with the hondata reflash and ice box now with the same issue only more slight but im not driving it till the summer so I want to get to the bottom of this before then.
 
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