i have some questions about some issues ive been having.i have a b20 vtec with gsr head and manifold..sometimes it feels like it rips and sometimes it seems very sluggish, i also dont think that the secondaries are opening could this be killing my torque? i am missing the vacumn line that goes to the pic below.
i have read that you cant take out the the secondaries. so any help would be good.

i also recently got a knock sensor on it so i dont have any cels, what conditions make the car not activate vtec? i can hear the crossover when i first start driving but after a short trip it seems sluggish.. thanks for any help

 

you can feel a bit of a diff when your secondaries open but that wouldnt make your car run worse sometimes it would be the same all the time...it could just be temp and humidity changes in the air