The key to trying to diagnose this problem via cyberspace comes down largely to this question:
When it seems that power is not getting to the drivetrain…Does the tachometer indicate abnormally high RPMS, or are the RPMs normal for that speed?
In other words, is the engine racing while the car is taking a long time to accelerate, or does the engine seem like it is turning at a “normal” rate?
If the engine is racing, that would seem to point toward a slipping clutch, which would certainly not be unheard-of with an 11 year old car.
If the engine is not racing, then the problem is likely to be either an ignition problem (When were the spark plugs last replaced?) or a fuel supply problem (When was the fuel filter last replaced?)
If maintenance items like the spark plugs and fuel filter are up-to-date, then another possibility is a failing fuel pump. What this is not likely to be is anything related to engine seals or those mysterious bushings.
Sensors are also a possibility, but there are…a lot…of sensors on modern cars, and you would most likely have a lit-up Check Engine Light if there is a sensor-related problem. Is the CEL lit up? If so, having the stored trouble codes “read” at an auto parts store would help to focus on which of the many sensors might be involved.