Well my 99 has been running rather poorly,and mileage seems to be down.
Also, I hear a strange sound, like the exhaust plugging, runs like its laboring, then all of a sudden it runs fine, smooth etc. but it does this quite a bit.
Reading through the forums, I read about the back pressure tube/sensor.
Went and looked at mine, and the tube is broke in half!
go figure, only 240K, Well, I am hoping this takes care of my problems, ($67 at Ford for the tube, If I replace the sensor, $127) but since the tube was not plugged, I am going to try just that first,. actually came right apart, exhaust system parts, and I was actually able to unscrew them with ease. ( i have had the truck since 2000, so I know this was never looked at. Everyone is saying this is an annual maintenance item.
Well see how it runsl