Hi!
I had the same problem ... my GSR just didn't feel like it was going into VTEC and just didn't sound right. I had a bunch of the things you guys were talking about looked at and it turned out it was just my air filter. That's right ... my air filter was so dirty my car couldn't breathe and get enough air pressure in there to pop open those valves. I hope your problem is as simple as mine.

Erika