So i just installed the B&M frp and guage pressure is set to 42ish at idle with the vaccume line hooked up...now during my search people say to remove the cacume line while adjusting the pressure well when i diconnect the vacume line the car idles up and down up and down and the guage bounces back and forth between 42ish and 55ish is this normal.

 

Well, unless you plug the line you disconnected, you are intruducing a huge vacuum leak the ECU tries to compensate for with little or no success.

 

Hmmm well i plugged the line with my thimb...perhaps not good enough? Also im removing the line form the intake manifold rather than the frp is this the correct way or should it be the other way around.

 

disconnect hose on FPR, Plug hose or port to the intake manifold, while leaving the hose connected to the FPR, adjust it to spec

 

However you take off the line is up to you but you have to cover the intake manifold side or youll get the vac. leak and idle. Then check your gauge.

 

HA...i was doin it back wards..thanks guys