I have a 2004 Ford F150 5.4 trition V8 ext. Cab
my ford has over 255,000 miles, it gets 350 miles on a 22 gallon tank. I know I have a vacuum leak an the fifth coil that is misfiring. After it warms up in sputters a little til I accelerate which I know is the coil. It also stahls out at stops or backing up, an sharp corners. But stopped after we put in the oil. its done fine til my hubby checked the oil an there was none. So he thought there was a leak so I had put in the stop leak with 6 quarts of oil. well when we went out I noticed that there was lots of oil on the ground. so I know I needed to put more oil in any way so I put another 45quarts plus another stop leak which it says 1 for every 4-5 quarts. Then again there was lots of oil on the ground. I did not check the oil an put more oil in an another stop leak. But I put in 5w 20 like it said, my hubby had put 10w 40. well its over full. so after dropping my hubby off at work it started sputtering an stalled out an know will not start back up. its turning over an its almost there but ive tried all day an nothing. Could it be to much oil an different oils. I remember when I was younger having to put an additive in it. My hubby is no help right know. Cause he knows he messed up. or is it something else. Sorry for the long post wanted indepth look.
How much oil is it leaking? Drain the excess oil but I think you need to fix the leak and do a tune up and install at least one new coil.
Your engine may have the old three part plugs where the electrode protrudes way down in the cylinder with about one inch of neck with no thread. With that many miles, and who knows how long since a last spark plug change, carbon buildup around the neck will probably have the plug stuck in at that point. It is very easy to break the neck off inside the head which is very expensive to repair. I know the 3 valve engines have these types of plugs. Best to have a mechanic change the plugs and the labor will probably be expensive due to the changes of breaking a plug or more inside the head.
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