International TD20 DVT573 V8 "flutters as turbo comes on"

History: This dozer was working fine when parked, then, sadly NOT USED for 5 years.


Got it running: Did all the new filters, oil etc... started and ran GREAT! But........

When you start to push or put a LOAD on the engine, as the turbo would normally build pressure (I presume) to increase power, it begins to produce a VERY AUDIBLE FLUTTER SOUND out the exhaust and power NEVER comes on.
Back off load and runs GREAT!
No other noises or irregularities.
With NO LOAD it will reach full RPM...

International TD20 DVT573 V8 "flutters as turbo comes on"