Hi, i recently came along a Tial Bov and stuck it on my 1g dsm. Seems to stay open at idle and when boosting makes my car jerk real bad. My boost gauge jerks from like -5 vacuum to 0 and the jerking is pretty bad. when the car is fully warmed if i barely hit the gas it makes the car jerk. I dont dont whats wrong with it. any answers?

Thanks everyone