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2007 Lincoln Navigator engine issues


Topic starter

I recently purchased a 07 Lincoln Navigator L, has the 5.4 with 144xxx miles. At around 40-55 mph it starts getting this "quick dip in rpms" almost like a miss. When idling, taking off or on the interstate I don't get this issue. Only when driving city. I changed all ignition coils and spark plugs. I also ran seafoam through the tank twice. Still having the same issue! Please help 

1 Answer

How old are your air and fuel filters? Is fuel pressure OK? Did you scan for codes and live data?