Isuzu Repair: 92 Isuzu Pickup, diaphragm spring, clutch fork

Question
I had my clutch replaced and about 3 months ago and now when it idles or runs for an extended period of time it drags on take off through all the gears and then all of a sudden stops. It doesn't perform like this at start up only on extended use or idle. I took it back to the repair shop and they couldn't find any thing wrong with it...but something is. Iv'e taken it to have the transmission flushed and lubricated and that didn't correct the issue. Any advice on this is greatly appreciated. Thanks.

Answer
Hello Teddy. A dragging clutch could be caused by a bad clutch fork, diaphragm spring/s has failed. Worn or loose transmission mounts causing transmission to move or jerk as it tries to shift gears. Worn spline or transmission shaft. Warped pressure plate/flywheel. incorrectly adjusted clutch cable operation(too tight). I hopee this helped a little but Teddy. If you need more assistance tho I am more than happy to help you ok? thank you for asking me.