I have a 1985 Mustang LX 5.0 convertible. The car is all original with a CFI with the 4 speed auto. Everytime i start the car whether its cold or warm the idle is low. It idles around 200rpms - 400rpms. After about a minute of idling the car jumps to the normal idle and will drive smooth for forever until the car is restarted. The car was fine until we took the car to a shop to get the timing checked. Once we got the car back is when i have started having the idle "problem." Any help or suggestions on how to fix it would be appreciated.

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