p0507

So I did a Gasket job on my 96 lesabre. It was all stock and factory until I worked on it. Now I’m getting a whistling squeal but when I remove oil stick it goes away. All gaskets are correct I changed almost every sensor / valves that could be the culprit still to no avail. I noticed where the...

Hello, new here and seeking some help. This is going to be long so that maybe I've done something unknowingly has caused the problem. Here goes, replaced lower and upper intake gaskets in my '97 Lesabre, 3800 Series II. All went well, sort of. Forgot to put the hard plastic tube in the upper...