Major timing corrections, super knock & misfires

Msport335

Specialist
Jun 7, 2018
97
24
0
How did you increase the vacuum.. by replacing valve cover and gasket ? What if it's cold side turbo seals ? Any signs to either of those being the culprit?
 

Msport335

Specialist
Jun 7, 2018
97
24
0
If this was a crank case vacuum issue, how could it just appear when prior to this everything ran fine with minimal correction on the same tunes? Only thing I can think of is valve cover degrading over time. How can I determine if its cracked since its not clearly visible ?