450SEL first shakedown after purchase.

I bought this 1974 D-Jetronic 450SEL from its original owner, it had some issues but was well serviced and cared for but D jet cars (Early EFI) were a bit unknown with most auto mechanics and a common issue was idle speed via bad and incorrect adjustment.
I cut my teeth on this car's EFI system and self taught Bosch D-Jetronic systems after I suffered a Stroke and resulting memory loss.