New to this forum and just purchased the subject skid with 1,300 hours on the clock. After running a tank of fuel through it it seems to have a strong vibration at almost any engine speed. This is a 3-cylinder turbo motor. It shakes quite a bit and I don't think this is typical. Power seems fine and it does not smoke (black, white, or blue). It rattles the body panels hard enough to make them chatter very loud. My question is: what are the typical sources of engine vibration for these units? and what are the diagnostic procedures to determine them? Thanks in advance.