hey guys..

Need some help.. Just picked up a 98 accord v6.. I have been driving civics and preludes all my life but the accord is very new to me.. I have a check engine light on and I am getting the following codes..
- 12
- 71
- 72
- 75
- 76

I know what the codes are for but any idea what would be causing them?? The car runs good.. But feels extra slow.. Can't really tell if vtec is coming on or not.. Is vtec on these cars pretty quiet?? Would these codes cause the vtec not to come on??

Thanks