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1993 Ford Taurus 3.0L, not SHO not altnetative fuel.

On COLD startup (its about 60 degF outside temp) with transmission in PARK engine idle speed oscillates with a period of a few seconds from a reasonable speed to a speed so low that it almost stalls. No check engine light or any malfunction indication.

After driving and egine is warm the problem goes away. The problem only happens with a cold engine and only in park.

Any ideas?  - Thanks  

your idle air control valve might need cleaned.  

It might be the new gasoline. With this stuff, you are lucky that the car even starts!