This is a discussion on 03 subaru bad idle problem. what to do? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by vaugghann The only thing it doesn't support is the fmi. Why would that matter? Here is an ...
If this is the case, I'd suspect you have a massive vacuum leak. It would be helpful if you can read and post your fuel trims.
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