I was having some trouble not being able to boost over 5lbs, otherwise car was revving and running fine. I found a couple leaks, plugged em and patched em, and now i'm boosting fine (fine being I can hit 10lbs again, still having trouble when raising boost) however every so often, and it seems to be completely random, I won't be able to rev above about 6k, even happens on cool nights when shes as warmed up as she can get, i don't really have any idea why this would happen so any help would be appreciated

 

What kind of car is it? Does it still have stock ECU? Need more info on car and possible changes if any.

 

i have the same problem on a fd3s with stock ecu wil not let me rev over 6500 it cut's out need help
thanks