96 Saturn SL1 Stalling Issues DTC P0133, P1599

Team, 96 Saturn SL1 4 Cyl. Engine runs for 7 to 10 min stalls. Wait for 10 min engine fires runs with no issues. Dash MFI lamp"Service Engine Soon" latched. First DTC set P0133, cleared with Tech 2. Ran for 8 min stalled No MFI lamp, DTC P1599, cleared. Replace down stream HO2 no change. Note: stalling issue continues to follow same symptoms, runs for 7 to 10 min no issues, then stalls. Wait 10 min engine fires. Note: no additional DTC have been set. Any Ideas

You might try this...my Saturn was doing exactly the same as you describe...
Start then stall...must let the car cool before it would start again....

Here's a link to my findings::
http://www.automotiveforums.com/vbulletin/showthread.php?p=5734207#post5734207