integra_101

My vtec engages at 5200 rpm. from 5200 to 5300, it misfires, or bogs. i hoover over 5200 and 5300 to check, and its a misfire or bog

Then when I power through it as if im engaging normally, it just powers through the issue

what can this be

thanks

Anh Meo

What plugs are you running? Could be that. Or perhaps the air/fuel ratio at the higher RPM. Doubt that it is a fuel injector.

nemesis25

Your Vtec has a hole in it.

integra_101

NGK iridium

And a hole? like in the vtec solenoid gasket?