2008 expedition rpms rise when put in park or neutral ?

bigred4x4bigred4x4 Member Posts: 2
edited September 2018 in Ford
When I drive it, then put it in park the rpms rise until I put it back in gear, now starting to hesitate and jerk when driving, have had the throttle body replaced still didn't fix the problem. Please help on any suggestions of what it could be.
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Answers

  • Mr_ShiftrightMr_Shiftright Member Posts: 64,482
    You might check the Idle Air Control Valve (IAC) and test it to see if it's sticking. Also, it is possible to have purchased a defective Throttle Body, depending on the source of the part. A good scan tool should help isolate this problem.
  • bigred4x4bigred4x4 Member Posts: 2
    The shop that replaced the throttle body, changed it out twice thinking it was defective. I'll have to look into the iac and see if that may be the problem. They say no code comes up.
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