Got my car back after a complete rebuild back to NA. I noticed that it won't hit VTEC nor will it past 6K RPM. The motor jerks after that, as if it was the rev limit. I'm using the stock ECU the car came with. I'm not sure what the problem is. Everything is stock except adjustable cam gears, bb6 type s pistons, and aem pulleys. There are no check engine codes except 67 which is because I don't have a cat. Oil level is OK, VTEC solenoid plug is connected.

 

Check out the FAQ, it covers on this topic why VTEC doesn't engage.