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After warming up, idling around 480 which is giving the engine mounts a work out. Short term fuel trend showing -5% or so when I rev between 1000 and 2000 RPMs. This is my moms car so I don't know what it was doing long term but it wasn't idling this slow when I got it last week to bring it home. I suppose it's possible that resetting the long term fuel trend when I pulled the battery is exposing an existing issue but I don't think that's it.

The only thing engine wise I took off when I remove the transmission was the air box and what I'm guessing is the PCV return hose upstream of the throttle body. All that's back together. The bands for the airbox are correctly tightened and there's no obvious hiss from any sort of leak.

I'm stumped.
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