rough idle And missing out while driving on 1999 Ford Expedition

rough idle missing out,stumbling ,hesitating while driving

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3 answers
plugs and coils are a good start. labor intensive if you have rear heat

Roy
I CHANGE THE PVC VALVE AND ITS STILL RUNNING ROUGH HIGH RPMS BEFORE CHANGING GEARS WHAT COULD BE THE PROBLEM
Could possibly be your IAC (Idle Air Control Valve). On the 5.4L it is located under the fire wall. On the 4.6L the IAC is located driver side rear portion of the throttle body. Hope this helps