86 560 sec rough idle when cold

[aroundthescenes]

My 1986 560 SEC idles rough when it is first started, it does smooth out when the water temp gets above 80, but it still has a slight rough idle. I have change the vacum fittings and lines, has new plugs.

[Oracle12345]

this may be normal and is nothing to worry about. When you first the engine it will be running in a rich state causing the idle to be rough. Your car is in open loop. As the car warms it becomes more lean and goes to a closed loop because the engine coolant has reached the proper temperature