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If you can check the break off pressure on those old injectors. It was about 1800 PSI on the same era Mercedes.
Typically the springs inside the injector assemblies get weak and the break off pressure drops to 1500 PSI which makes it run ruch and smoke due to poor atomization. You can shim the springs or replace them to get the pressures back up. That will get you better mileage and reduce the black exhaust smoke dramatically IF your pressures are low when you test them.
regards
Mech
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