Almera Tino 2.2 Diesel power loss 2003

Hi guys

Anyone know of common problems that cause intermittent power loss. The car does siphon fuel if left on a hill but the latest problem has occurred long after the first problem. How can you test for air leaks in fuel system? Sometimes a get a knocking sound as though just one cylinder isn't firing then I have also had loss of power where no sounds occurs but the power loss is a lot more severe?
 
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