I have a 1986 for ranger that sounds sluggish on idle not bad just not great. If I push a little on the gas the idle sounds perfect.
I am wondering how I can achieve the same affect automatically?
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This depends on if you are carb or EFI.
First, make sure everything is in proper working order - clean the carb/throttle body, no vac leaks, good fuel pressure, plugs, wires, cap, rotor, timing, advance. Any of these can give you a bad idle that may seem to disappear at higher RPM.
EFI - your IACV controls the idle speed. If it is not idling correctly, it is likely that either the IACV port is dirty, or malfunctioning. There may be an idle screw, but this is not recommended.
Carb - there is typically an idle screw you can use to set the idle. You might want to also consider the choke, fuel mixture and timing. Make sure these are set/tuned to factory specifications.