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Q:

rough idle And missing out while driving on 1999 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
rough idle missing out,stumbling ,hesitating while driving
(3) Answers
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