Any ideas what would cause a knock when releasing the clutch at a stop in neutral? More noticeable when I quickly take my foot off. Also happens when letting off the gas abruptly. The clutch does jutter when engaging 1st from a stop which greatly improved with a new transmission mount. (Motor mounts to be replaced next) The knock sounds and feels rotational. I'm hoping it's not loose transmission to bell housing bolts. I'll check them asap.