Ok, I am going to replace the fuel filter, air filter, spark plugs, and change the oil. We will see if this corrects the idling issue. On another note, I have gotten a loud siren noise while starting the car twice in the past week. Literally sounds like reverb or the sound of the emergency broadcast system. Seems to be coming from under the hood with radio and ac/heat off ?? The most bizarre sound I have ever heard a car make...high pitched whine.....freaky....almost as if the noise was coming from the speakers !!! ??? No mechanical issues accompany the sound except for the idling issue. Will post after work is done.

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1998 C230
1994 Infiniti J30T
1984 BMW 318i
1987 VW Golf GT
1975 Buick LeSabre Conv.