Quote Originally Posted by Ultra440 View Post
On a similar note, I see vacuum as low as 25psi going downhill when I'm set on cruise at a lower speed than im going. Like if I'm set at 70 going 75 downhill and let off the gas the psi will drop. I never saw lower than 22 until I replaced all of my vac lines, does anyone have any experience with what normal ranges should be?
IIRC normal range at idle should be around -20, but it has been awhile since I've driven a S/C Grand Prix.