mustang323258
New Member
we have a 2004 expedition and recently it started running rough the service engine soon light came on and coded at PO300 PO301 we took it to the shop and they replaced all the spark plugs and the coil pack on cylinder one. it has new brakes,rotors, alignment and positive battery terminal. The battery is 5 years old and we are going to replace it soon. the problem is it still runs a little rough. Sometimes it seems fine and others times it doesn't. when accelerating slowly is seems like it has a vibration sometimes and other times it seems like its missing. if you come on to the gas hard it doesn't do it but the service engine light starts flashing for about 5 seconds and goes out. If it has been sitting for a few hours it will go fine for a little while before it starts doing it again. If it idles in park it idles fine but when idling in gear it seems rough at times.