1996 Ford ranger accelerstion/clutch issue?

At a stop, clutch pressed in with brakes pressed. Start to release the clutch pedal alongside stepping on accelerator. Truck slowly starts to move at maybe max of 10 mph. Loud clunk is heard from around where the tranny meets the engine, then truck accelerates like normal. Now when accelerating engine rpms do not rise alongside pressing the accelerator, almost as if the computer is keeping it from happening. Issue has persisted for awhile, haven t had the chance to tear apart. If torn apart I ll be replacing the flywheel, clutch l, pressure plate, slave, pilot, and the master. Just to eliminate any possible problems and the fact that I don t want to do it again for the 3rd time around. Previously replaced the clutch and slave at 130k. Now at 160k

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