I have a Allmand 425 backhoe with a Kubota diesel engine. I was moving some dirt and all of sudden the engine started pulling down and died. I looked over everything and didn't see anything. I started it back up and it runs fine as long as its sitting still. When I turn steering right and left you can hear noise like power steer i low on my truck. If i run it with the forward pedal mashed all the way it will pull engine down. If I let up on the pedal a little it will go on. Any idea what might be going on? It has all new filters for fuel and Hydraulic.