Welcome to the Bonneville world James!
A bad coupler would cause just that horrible noise.
Bad vacuum leak or dirty fuel delivery system would cause hesitation.
A bad BCA/BCS would cause low boost conditions.
^^^/^^^ Boost Control Actuator and Boost Control Solenoid
Once you replace the coupler and and check all your vacuum lines, tune up, fuel filter and so on.......check out this thread
,it helps to diagnose low boost and gives test procedures to rule out the BSA and BCS
I would not try the bypass until
you have your motor running well enough to do the bypass test.