2003 Ford Expedition Q&A
2003 Ford Expedition Question: Rough Idle stalling in turns, Leaps forward when I stop sometimes.
most commonly,vacuum leaks are very notorious for these concerns.get access to a good scan tool to monitor your fuel trims.a positive 15% or above fuel trim usually indicates a pretty good vacuum leak.check your pcv tube attachment at the back of the throttle body.write back after you try this and I will be happy to help. - bmdouble
Check fuel pressure. Some models of the expedition tend to stall when making a left hand turn and fuel is below 1/4 tank due to faulty fuel pump. - Joe Book