Large RPM and Vacuum drop when shifting from park to gear

upload_2020-10-14_8-41-14.png

That looks like a problem for car that ought to be using vac advance, BUT that may be jumping the gun.
Not enough info here. What's the timing below 2000 rpm? What's the slowest idle speed attained with the engine warmed up? What is the drop in rpm when placed in gear?