hi i have a JDMb16A the car runs great and idles right but it has a very slow throttle response and the car will drive great till it hit vtec i can hear vtec hit but the car just wont go it like it just bogs out right at 5000RPM if anyone has any idea wat it could be please let me know i thought it would be the ecu but i was wrong the car has a stock P28 i tried a stock P72 and nothing happened it still has the same problem so if u can help me please let me know thanks

 

any check engine lights?

 

Have you timed the car?