hello I would like to know that I make my 2003 Civic Si that change in the 3rd when he enters the acceleration failures at 6000RPM and checking engine turned on and off for a while
I changed the coil, I've changed the filter pump gasoline, and there is no change always Friz change in the 3rd

 

it sounds electronic (ECU-= not cheap!)
...take it in, have them scan for codes.

they can hook a scan tool up, take it for a drive, and see what codes it sets off.

any other "guessing" and you may be replacing good parts...

good luck!

 

I get the code that I think is P0303 and the ECU missed Fire exits