I've had my turbos working well for around 10 years now. But now when I hit WOT, my boost slowly...very slowly...goes from 0-5psi then at 4500rpm it will spike to 8 and go up and down and up and down (bounce).

I've checked for obvious leaks, tested my abv and crv for proper functionality, and can't for the life of me get this to work.

Any suggestions?

 

Just an off chance, you've checked the MAP/Boost sensor connection on the firewall on the driver's side? That hose comes off often.