Car wouldnt die when changing fuel filter

Ok heres the story.....I put the car on jack stands, started her up and went to the trunk. The little red button was already pushed down so I got it to lift up then the car started idling like $hit acting like it was going to die but after about 5 min. the damn thing was still running. I dont know what the problem was. Can ne one help me?
 
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When I tripped mine to change my filter it took a good 15 min. or so to finally die. I couldn't believe it, but if finally died.

In retrospect, just let the pressure out from the schrader valve on the fuel rail.