last night i installed my prosport boost gauge and was not getting the boost gauge to read boost, i used the same vacuum line as the bov which is located under the throttle body. so this morning i was looking at the vacuum line and i noticed there was a small one way valve on the line so i removed it and tried again "walah" now i seeing boost but at stops the car stalls and struggles to idle also during driving the car backfires alot too...so what im thinking is to place the vacuum T fitting before the one way valve should this correct my issue? or should i get my boost gauge vacuum source elsewhere?

thanks

greg

The "T" should be placed before the One way valve. With the green side of the valve toward the "T" fitting.

vfad nipple on the bttom of the throttle body is a popular choice. I don't know why you're looking at the back of the intake manifold.

ok thanks for the info

ok so i just came back from a drive i moved the one way valve (greddy rs bov,one way valve, t fitting, vacuum port under throttle body) the green is facing the t fitting...car holds better at idle but still struggles to stay on and in between shifts sounds like im getting compressor surge???

now i disconnected the boost sensor and put everything back to normal and im still getting a rough idle at stops and at times it will stall?? i reversed the one way valve green facing the bov and idle is perfect while coming to a stop but im getting compressor surge??

RE-check everything.

You have a vacuum leak somewhere would be my guess. Recheck all the lines.

would a pressure test find if there were a leak?