Have you ever changed the spark plugs? ..changed the fuel filter?.. air filter??.. replace these and see if it gets better.. you can do this yourself..
get one of these..
2004 Ford Explorer Repair Manual Vehicle Maintenance
http://www.rockauto.com/en/catalog/ford,2004,explorer,4.6l+v8,1427802,literature,repair+manual,10335
SOURCE: 1992 lancer gsr 1.8 dohc turbo. 4g93t eng cd5a chassis. start trouble shoot
9.3 is a really dead battery - replace it and check the alternator. I have seen them go bad with no dash indication. As to the oil being black, you may have worn piston rings, and probably need an engine re-build. Worn rings allow the exhaust of the engine contaminate the oil - you should also see increased oil consumption due to the vapors exiting via the PCV valve and being burned in the engine.
SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..
SOURCE: 2001 Ford Windstar runs rough.
remove the coil pack and look at bottom of it if it shows any cracks coil is bad very common on these vans if you have a noid light check for injector pulse on #4 if you have pulse and good blue spark most likely the injector is bad you have to remove upper plenum to get injectors out let me know how you make out
SOURCE: 2000 Ford Taurus Flex Fuel V6. Check engine light
your code is or the following. Fuel Pump Secondary Circuit Malfunction. This may involve removing your gas tank to fix. Go to the parts store and they can get you the parts you need and let you know for sure.
SOURCE: I received a code PO176. The engine runs for about
You will have to change the flex fuel sensor on the truck sounds like its working on and off.
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