[s-cars] B5 boost problem

[Cole Ford]

I intermitently get code 17965 Positive Deviation. (actually sometimes it seems to read positive and sometimes negative)

Usually this is associated with a boost leak. We have pressure tested the car and it will hold enough pressure to blow the tester apart. (full Samco hose kit and vacuum hoses). 

Running GIAC-X, TCD, MBC, K04s etc. 

Logged 115 last Friday. My actual boost will vary from requested by as much as -600 off boost to +800mbar under "some" throttle but not WOT. 

If I just drive the car in normal traffic (not spirited driving, but just hanging out) I get enough boost variation to throw the car into limp mode. If I get more spirited I usually don't get limp mode out of it. 

???????