Revving Engine on 1993 Ford Ranger

So, I have a 1993 3.0 v6 Ford Ranger with over 200,000 miles on it. I have had the transmission replaced and the clutch. This happened before and after these massive repairs to the truck. Basically what happens sometimes is after reaching a speed of at least 40mph and then approaching a stop without down shifting, the truck will sound like I’m revving up the engine while I have my foot on the clutch and braking. If I slowly release the clutch, the revving will stop. This has been happening for years and I haven’t been able to find a patter as to why/when it happens more often, but it doesn’t happen every time I drive it.

Thoughts?