loss of power at 5800 RPMs

[Contr_eras]

Hey guys old thread I know, I figure I'd throw in what led me to the throttle body. I hooked up the Durametric and had a friend watch all the numbers and info for anything strange/out of the ordinary and saw that the throttle body would just close at 5800rpms exactly. To this day I'm still not sure why it would shut but the stock throttle body fixed it. I still have the 74mm throttle body and might try to run it again someday if I find a good plenum.