rpm goes up and down. Sometimes engine goes off. Somebody have a idea why ?
Bad EGR or throttle position scensor.
items to look at would be mass air flow sensor, idle air control motor, and fuel pump
dont forget your ECTS (Engine Coolant Temperature Sensor)
ECTS wont cause his problem,all a bad one will do is give a false temp reading to computer and gaduge,yheir is one for both,but this is not his problem.
well im not going to argue with you about that one. it could also be an intake leak. check all your vacuum lines and intake manifold.
Looking for a Used Expedition in your area?
CarGurus has 24,634 nationwide Expedition listings starting at $1,500.
Search Ford Expedition Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Expedition Experts