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Engine swap= CEL codes and engine shake


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I just put in a new engine into my 05 2.5i Legacy. After all was done I realized that at idle the engine shakes the entire car badly, all the way to the end of the exhaust. I'm also getting CEL codes P0301, P0304, and P0000. And it also smells like it's running rich and I've been getting horrible gas mileage compared to the old motor. Can someone please tell me what's wrong, and what I can do to fix all of this. Thanks in advance.
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The plugs and coils all seem to be fine. Yes I use reused the exhaust. The cats seemed to be fine when the old motor was in so I don't see why that would change.

 

IF they are clogged up they will cause this very problem. Check the wires as well and the throttle sensor

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