1983 300d white smoke, no power

need help. i have a 1983 300d 150k on the clock. hard start when cold, heavy white smoke through out operating temperture, no power. compression at 330psi all cylinders.check diesel fuel, ok. replaced all fuel filters and in tank screen. replaced all glow plugs,relay. replaced all injector nozzles. replaced all fuel hoses and plastic lines. problem still exist.performed timing chain stretch. Found 6 degrees after tdc. any ideas?

Forums

Diesel Engine Specific Aid

Chassis Model Number

W123

Take to radiator shop

And have your cooling system testing for possible cylinder head crack. At least you can eliminate this out of the equation. White smoke usually indicates water in combustion or bad fuel.

I've tested the cooling

I've tested the cooling system. Holds pressure cold and operating temperature. Coolant stays at proper level. Meaning I'm not needing to add coolant.
Diesel tank was flushed out. Installed fresh diesel. Problem still exist.

More detail needed

When did this problem start? How long has it been doing it? Anything changed or happened just before the smoke started?

Well the smoke is only

Well the smoke is only present at idle. It started smoking after normal driving. After work.
It starting idling rough and smoke was white. On acceleration white smoke is gone. When turbo spool up I get alil bit of black smoke which is normal. But when it returns to idle white smoke and sometimes it does stall when Vehicle is at operating temp. Intermittent only on the stalling. Just smoke and rough idle.