My Ford Focus is idling rough in reverse or drive but when it warms up it stops doing that. I'm trying to change the fuel filter but I don't know where its located and how hard it will be to change it. I've already changed the sparkplugs and now I'm trying the fuel filter. Any ideas would sure Help? Thank You!!!
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Dirty air filter, dirty throttle body...try 2 bottles of gas line fuel injector cleaner...has your car been parked for awhile? Heet gas additive will work on any low gas tank sludge that you may have. Hope this helps.
i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
a valve burnt/stuck could be but you dont see much of that anymore
could be coolant leaking into cylinder from leaky haed gasket but you would have to add coolant every so often
i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next