idle changes when pressing clutch

[viridionplague]

throwing in an update as to what is happening

started her up today. idle was rough. pressed in the clutch and idle went to normal. i very slowly let off the clutch and the idle changed just slightly but still idled smooth.

pressed the clutch in again followed by letting out the clutch quickly and ended up with horrible shaking.

anything i can check out without dropping the trans?