Vacuum leak

[Nick Triesch]

After completing a full maintenance my car still has a vacuum leak that I cannot find . The reason I know is when I remove the oil cap my engine no longer looses RPM’s like it used to. I have checked, tightend all visible vacuum points. I replaced the intake gaskets. To check for leaks I use starter fluid and I found many leaks . I also replaced the copper pipe on the back of my 3.2 motor. I cannot find the leak!Is there any other place I should look that I cannot see? By fixing vacuum leaks I was able to get a great idle again at start up and while driving. Just cannot figure out why RPM’s no longer drop while removing cap. Thank, nick.