1992 Isuzu Rodeo Clutch Problems?

You have clutch drag. There are a number of possible causes for this. As you have had the clutch, m/cyl and s/cyl replaced; I would rule out a hydraulic problem, as long as it has been correctly bled. The release bearing should have been replaced as part of the clutch kit and the withdrawal arm checked. So, that leaves 2 possibilities. The clutch is releasing fine but something is driving the input shaft to the gearbox and the 2 most likely causes are too thick an oil in the gearbox, or the most likely culprit, is a bruised pilot bearing in the centre of the flywheel that is dragging the input shaft around, even though the clutch is released. This can easily happen if the gearbox is hard to put in or the clutch is not properly aligned. Both of these conditions will be worse when cold.