could be bad injectors
Symptoms of weak injectors in a 1997 Ford 7.3 diesel may include rough idling, decreased engine power, poor fuel economy, and increased exhaust smoke, particularly white or black smoke. Additionally, you might experience hard starting or misfires, especially when the engine is cold. If the injectors are significantly faulty, you could also notice a rattling noise from the engine as it struggles to maintain proper fuel delivery.
underneath fuel injectors small with nut and cable going to them
32.75 qts.
you take it out
injectors are a common problem
15 Qts
ask a engineer
You could try a chemical cleaner available at auto parts
8.8 or 9.75 ?
Do not touch them if you do not even know where they are located.
There isn't one!!