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I have a 94 Sable with 3.8L engine. I had a problem similar to what you are experiencing. The car would idle rough. Over time it began to stall and stalling became progressively worse, mostly when idling for stop light. My problem was a cracked (nearly completely open) vacuum line. I suggest you carefully inspect the vacuum lines. For the most part they are easily assessible. Interesting that once I replaced the rotted vacuum line, the car ran great, but my check engine light came on. Went to Autozone and had the code read. Bad EGR valve. I replaced the EGR valve, the light went out and the car is running great and passed emissions testing well within the specs. Good luck.
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