Not Ranked
Here is an example of a problem spotted on the dyno.
My friends car was "running rough" around 4000 RPM.
He told our dyno guy about it.
He did an initial pull - see the erratic set of HP/TQ lines.
They are broken at about 4300 RPM because the operator stopped the pull.
He then made some corrections to the car (sorry I don't remember what) and did another pull. That second pull where the lines meet about 5000 RPM corrected somewhat but his A/F ratio was off so he discontinued that pull as well.
The engine was never in danger during the session because the operator was paying attention and doing his job.
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