Rough Idle stalling in turns, Leaps forward when I stop sometimes. on 2003 Ford Expedition

My Excursion has a Rough Idle. Sometimes when I am stopping It will lunge the SUV forward. I tried to Replace the Brake Booster which was bad but it didn't stop any of the problems. Any idea what the problem could be?

by in Tampa, FL on June 16, 2010
2 answers
ANSWER by , August 14, 2010
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.
ANSWER by , June 03, 2012
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.