Hi, my 90 300tdi year 97 150k has gradually become very sluggish and underpowered its pretty much like a NA 60-65 flat out. no smoke, starts easy. Just serviced it. So far Checked pump timing/cambelt, injector diaphram, all hoses/connections. It also is a bit tappety noise on tick over and while driving it. Could this just be due to old age losing compression or do you think there might me an easy fix. Is there anything on the electronic side that could be causing this will it benefit blanking egr valve? I can feel the turbo kicking in but might the turbo side of things be at fault?