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My Subaru Outback began suffering a severe lack of power

Car: Subaru, Outback, 1996, 2.2L     -    Back to Fix-It    -    Subaru Repair Manuals

Q.Recently, my Subaru Outback 1996 2.2L, 135K miles. (manual transmission) began suffering a severe lack of power (i. e. you'd hit the accelerator pedal, engine would throttle up, but the car would not speed up). I've replaced the front and rear converters, but I still have no power.
I did not replace either of the O2 sensors (put back on the originals) that go on the converters... should they be replaced as well (though usually when any sensor is faulty the "check engine" light goes on, and it's not)? I have an entry level ODBII diagnostic device that doesn't say much (no faulty sensor, etc). I'm just not sure what else is causing the lack of engine power. Any suggestions?

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I already checked/done: Catalytic converters replaced, and also replaced faulty knock sensor prior to converter replacement

More Info required The first thing that caught my attention was when you said "(manual transmission) began suffering a severe lack of power (i.e. you'd hit the accelerator pedal, engine would throttle up, but the car would not speed up)."
That tends to lead me to the clutch area..
If different, please explain as much as possible ..

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