hello guys, im from brazil, i have a civic Si 2.0 16 2007 - vtec engine...

my car have the cat. removed; cold air intake and unichip, everything was working very fine. In the last weeks, a fail/issue in the aceleration appeared.

If I acelerate the car from zero and making the engine rotate 8000rpm at the gear change, everything works fine.

but if I drive at second, third or higher gears, at low rpm, like 2000rpm and put the pedal to the metal (full throttle), the car in +- 4000rpm to 5000rpm stars to fail, like hiccup...
i changed the sparks, cleaned the injectors, verified all the eletrical conectors and the fail/issue continues...

somebody can help me?

sorry by the bad english

 

Did you get it tuned? I used to have what seems like the same issue when I had my old Fujita SRI where I could feel a hiccup if I got on it at low RPM's.

I'm not sure what the "Unichip" is (sounds like a universal tune/reflash), but I'd suggest getting Flashpro and a tune or e-tune.