Rough idle- rough driving
 

07 expedition has rough idle. Just happened out of nowhere. Slow acceleration rough driving. Rpms seem low when going 70. What could it be?

Sounds like a misfire . Ck eng light on ? Read codes to find the problem .

Check engine light will cone on periodically. Its blinks when it does come on. Then itll turn off for a while

If ck eng light blinks , It is a misfire ! No questions , misfire . Ecm flashes ck lamp during misfire !

Have your codes pulled to find cyl. that is missing .

If it is a missfire. How much am i looking at to fix? My vehicle is just out of warranty

DIY fix is the least expensive . Plugs , boots , perhaps a coil or two . Price varies too much for me to say . $3 to 8 per plug , Boots ? Coils $ 35 to $100 each . Get your codes , tackle those first . Go from there . Buy a cheap code reader at least . Then if you have your work "done" you at least know you aren't gettin screwed !

Easy enough for a first tine DIY?

With a Chiltons , Haynes , or a buddy with a twelve pack ,, easy! You need to do some research before trying . Not so hard , but a few things to watch for . A " newby " can do it . Just research it first ! Good luck .

Will do. Only prolem is that this is happening when we are out of town. About 5 hrs away. I it safe to drive home like this? I doubt a mehanic cn even look a it till monday

A severe miss can cause damage . Fore an example , I just did $1200 worth of work on a Toyota because of a misfire . Ford is better about protecting engines , BUT , ! I do not advise driving any distance with a miss.

Got it scanned. Brought up code 300. Myltiple cylinder misfire. guy at autozone said it could be the harness. What you guys think?

Guess I'm the only guy responding to you . Sorry . Multi miss . Ck fuel press , filter exct . Ck for vac leaks . Could have dropped a few coils ? wiring ? don't see a lot of harness issues on these or sudden multi coil ,plug failures . Ck fuel quality . Maybe a tank of bad fuel or E85 , if not a flex fuel . Jersey had a problem last year with too much Ethenol in the fuel from one distributor .

Not flex fuel. I did fill up with different gas before we left out of town. Usually put chevron gas but friday night i filled up with pilot gas. It burning gas like crazy. Autozone guy said to go to mechanic first thing tomorow morn. To narrow it down to specific cylinders

I just think its weird that the ck engibe light will go from blinking to i bein solid then back to blinking. When i blinks i will rough idle and run horrible. Whn its solid itll run better bu still buckle a little bit