4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

2003 4.0 low idle miss?

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Old 02-19-2023
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2003 4.0 low idle miss?

I have done a simple tune up. Plugs, wires, ignition coil. Replaced air control valve. Cleaned throttle body. It still has a slight miss or rough low idle. It doesn’t have any performance issues while driving except when sitting at a light or stop sign. What’s next?
 
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Fuel filter?
 
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Vac Leak?
Injectors?
Make+Model of Plugs\Wires\CoilPack\IACValve?
Plugs Gap?
 

Last edited by DILLARD000; 02-20-2023 at 02:13 AM.
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