Hello regsatx
Relax, deep breathing.
OK, now, one step at a time.
#1. Check the transmission fluid level, engine running in park.
#2. Check all vacuum lines in engine compartment.

Ignore the vibration for the moment, FOCUS on the transmission.
With a little good fortune, you will find a vacuum leak and fix both problems.

Adjusting the idle screw on the injection pump could NOT have caused this.

Do not take to a shop to find out, it will waste money.

Do not make decisions when you are tired, hungry or angry...

__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
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1985 300SD
1983 300D

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