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Did the; plugs, wires, fuel filter, distrubtor cap, PCV valve, new TFI coil; Now when I first start it idles fast to about 1400 or 1500rpm drops to 1000 then quickly to 800; I always noticed before I did the above mentioned maintenance that it idled at 5-600. FYI: This was the first change of plugs, etc for about 50,000.
Is the computer still relearning " What is the correct idle spped???
When you first start up your truck it goes into what is called "warm-up mode" the trucks computer raises the idle to help in warming teh engine faster. It will do this until the engine reaches a good temp. It usually takes 2-3 minutes, Depending how cold it is.
You can always stop the Warm-up mode by simply tapping teh gas. I always let mine go through as it is better for the engine!!
Hope this helps!