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replaced PCM and IAC motor and gasket 0ctober of 2014, engine replaced (used)2015 with new intake, oil pan and rear main seal gaskets. Drove about 3 days when check engine light came on. Idles high when started then drops to between 600-800rpm. Seems to idle fine when when warmed up and stopped, but sounds more like a "hot rod" when accelerating.

Vehicle: 2004 ford freestar limited 4.2

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Hi there,

This code indicates an issue with the electronic throttle actuator. Here is some info for you.

P0507 FORD - Idle Air Control System RPM Higher Than Expected

Read more: https://www.autocodes.com/p0507_ford.html

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