This is the Triumph TR-4 stunt driving scene from the 1976 miniseries "Rich Man, Poor Man, Book 2". I had not seen this since it first aired about 35 years ago, but loved it at the time because I owned a couple of TR-4's. I still have one, but it is a basket case.

The car in this scene is missing some side trim, and the some letters from the "Triumph" on the hood. I don't think that was intentional to hide the make, because the character does refer to the car as a "TR-4" earlier in the scene.