I have a 00 GS-R with about 58,000 miles on it. Today when I was driving, I tried to accelerate, and as soon as I hit 5,000 rpm (VTEC engagement) my check engine light came on and I cannot get passed 5,000 rpm. Drivablility under 5,000 is normal, but I cannot go above. Last month I advanced my timing a bit and adjusted my valve lash, so I don't know if that may have something to do with it. Please help !!!!

Jason