STEVE MICHAEL IS RIGHT HERE , YOU NEED TO GO AHEAD AND PULL THE LOWER OIL PAN AN TAKE A LOOK , THE MAIN CRANKCASE OR OIL PAN AS IT IS CALLED ISN,T NECCESSARY , IT IS MUCH QUICKER THAN THE OIL PUMP ANYWAY, GET A GOOD LOOK AT THE OIL PMP PICKUP AND LOOK FOR PIECES OF BEARING MATERIEL, I AM WONDERING IF MAYBE YOU LOST THE THRUST BEARINGS AND THE GRINDING IS THE CRANKSHAFT IS MOVING FORWARD WHEN THE CLUTCH IS DEPRESSED, THIS WILL DEFINATELY HAVE AN EFFECT ON THE IDEL OF THE ENG IT WILL SLOW WAY DOWN AND ALL MOST STALL, LOWER PAN WOULD BE MY FIRST STEP IF YOU HAVENT ALLREADY CHEDCKED THIS FAR JERRY