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2004 Lincoln Navigator Questions

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Well, when I got it home, the next day I had the oil changed and all of the spark plugs changed out. Still no change in engine performance. Still runs rough. almost like missing somewhere. I'm not sure how old the pump is. I bought the truck used. It had 121,000 miles on it and now I have 210,517 miles on it.
My Lincoln Navigator 2004 keeps stalling every time I put it in gear but have had times where I am able to drive it but it shakes really bad and sounds like it's going to stall on me. The emmision light came on not the engine light but was told it was one in the same. I just recently had it repaired for a head gasket and don't know whether the problem is related to the problem I'm having now. Which I would like to know before I take it back and complain, since they charged me $2000 & was good only for 1 week before the problem I'm having now started. I won't complain if it has nothing to do with the head gasket repair.I would like to know whether it is or isn't & what it can possibly be that is causing it to do this.
how to fix my rear sensor in my 2004 navigator
I have a 04 Lincoln Navigator, today it started puttin then shut off. Low oil pressure came on. Put oil and coolant in! Drive couple miles then shut off again. I started going to a new gas station thats 30 cent less then other gas stations in area
Could this be a problem? Did it mess something up or will it act right once better gas get in it?
i just change my lincoln navigartor the toque converter 5.4 , i put a torque converter 7.2 ,.will be any problem ? i feel sometimes like my car is going 120 km/h i and without i put too much gas
Miles an hr. I was thinking maby manifold or she valve, does have an vacuum leak but my mechanic says its an egr replacement or connector plate issue, no part store seems to know what he means but he's standing by the diagnosis. Lost!
Does not seem to lose any power. I was told that if it were plugs or injectors it would do it all the time. I was also told that my torque converter could be going out and to add friction modifier to solve the problem. Could it possibly be a my fuel filter?
Truck: http://youtu.be/_7OW2A42ZvU
I bought this car used. The air ride system was replaced with a standard suspension system. When I put my scooter carrier (with scooter) on the rear hitch I get a swaying motion at speeds over 40 MPH. I have used this carrier on Honda mini vans as well as Ford Expeditions without any problems. By replacing the air system do I now need to add a sway bar or some other components? I noticed that the carrier is about 3" higher on this car otherwise everything else is the same.
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