Update:
I changed the filters, did a test drive, then I did some tests with the pressure gauge.
On the pressure side it's making 5.4 and holding at idle. After turning off the motor, it held at 5.1 for over 5 minutes.
On the vacuum side it was pulling 9.9 at idle.
During the driving it didn't stumble until I got it above 60 mph. That's Ok since I don't drive near that speed.
Are these numbers acceptable?
