Hi guys, I just tuned the car 2 days ago and I cant boost over 26psi with GM 3 port that i Just install it and i used 4mm vacum line to install the GM3port its too small ? and i'm on stock WGA( I ran 90% DTC of WGA ) can it be cause stock WGA ? and run E85 wondering what the problem with ? what i do need to check ?

any recommend would be appreciate !

 

what boost levels were you running before? has anything similar to this happen to this car before? if so what was the fix?