i have a 98 f-150 with the 4.6 it as around 270,000 miles on it and the problems are getting worse the main problem is a knocking noise when it idles i havnt noticed it when accelerating..also my mpg blows last 2 times i checked it it was around 11 mpg...i use 10w30 in it change oil often too..had alot of trouble with things going out i have replaced the heater core (yea wont do that again ill pay 800 dollars labor,still cant get that glove box to line up right) ,power steering pump, water pump,thermostat, spark plugs totally filed down replaced with new wires, fuel filter, air filter all this replaced in past 3 months....anything i can do to get her running good again its been a great truck for the 130,000 miles i have had it

 

Did you consider your 4 post coils?
Did you also check your cam sensor? That many miles there may be gunk it.
Are you showing on your CEL? Any codes?

 

If the rest of it (tranny, body etc) is good, perhaps put in a new motor and have a "new" truck for another 270K miles.

 

I'm still fairly new to the site, and I guess this is the first time I've seen gunk in the cam sensor. Can you shed some light here? I have a 97 5.4.

 

thanks! i will try all that....i just dont feel like paying for a new engine and labor i am fixing to get a diesel

 

Not trying to be insultive but you do get 100,000 miles out of your tires, -not?
THE motor is wore out!
Is admiral you have that many miles but be reasonable.
The knock could be a piston slap, a bearing, cam drive related.
Get the diesel and be happy again.
This is what I would tell you face to face and not just from behind a key board.