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I've been working on a 1998 Legacy outback 5-speed that I purchased recently. After finally getting the starter to engage, the engine starts, runs for 2-4 seconds, then RPMS go way down and it dies. If I try to give it a little gas that kills in instantly. I've spent a good deal of time trying to get this thing started, could it be flooded? Also, the y-pipe is split (replacing soon), but could that be causing it to die? Maybe bad readings from O2 sensors, etc? Thanks.
 

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2014 OBW 3.6R Limited, 1997 OBW 2.5L Auto (sold, but not forgotten), and 1991 Ford F150
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Running for a few seconds and dieing is often because a vacuum hose is disconnected. The most common one left unconnected is the IACV hose where it connects to the bottom side of the air intake. See photo.

 
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