i might be wrong but maybe 3000 is probably when your vtec suppose to kick in, but ecu sees ur engine not getting enough oil pressure (sensor/sensor wire itself may be damaged), it will cut off the fuel like you're redlining it right at vtec engagement.

- CHECK OIL LEVEL,oil pump,injectors and vtec system;Vtec malfunction
- swap ecu with somebody n see if it does the same