When you are putting it in first, is the clutch allllllllllll the way out and acting like this? Or is it in the middle.
To test a slipping clutch without getting technical, get into 5th gear at a low speed, and floor the gas. If you see your rpm go up too much how much you acceleration, clutch is starting to go. The "slip" will slowly creep down to lower and lower gears, if you letit go too long. You can eventually be stopped, put car in 3rd or 2nd, drop the clutch, and car wwon't move or die. If your clutch is slipping, simply put, your rpms will jump above what they should be for the speed you are traveling.