Not trying to be a horses arse, but virtually every time one puts a vehicle in drive, the rear is "locked up". In fact, on all the modern cars (since the Audi "sudden accelleration" debacle) you MUST have your foot on the brake to shift out of park to drive or reverse.
Even if the rear were locked solid, the car should idle in drive or reverse w/o issue.
I still think the low vac is a clue to what is going one. Is this a new build, or has the engine been together for a while? How many miles on the engine?
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