That does not sound like a slipping clutch. If your clutch slips, it will not grab tight enough, and it will feel like the clutch is not engaged when you try to push the car hard like up hill or low speed in 4th etc, ie the revs will jump up and the car will not move with it.
Sounds like another problem like fuel delivery, if you jump on it hard in 1st and 2nd does it feel this way too? not enough info to guess
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