Injection rack on a 72 280SEL 4.5?!?
That engine has EFI......
I would suspect the cold start valve first. When it idles rough, clamp off the
hose at the cold
start valve. If it smoothens out, replace the cold start valve.
If it does not help, I would remove the distributor and take a look at the
trigger points. They may
have oil on them......
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