I'm hoping you guys can point me in the right direction.. My truck is a 2002 F-150 4.2l standard trans. I noticed it was lacking a little power one day and the next day a little more so,Then the third day I was heading out to the Doctor (50 miles away) I noticed the truck was slowly and gradually getting worse to where it was hard to even do the speed limit on the highway and the light started blinking so I headed straight to the nearest Advance and had them pull the codes and it gave us 172 bank 1 too rich and 174 bank 2 too lean I replaced the two top o2 sensors (advance sold me)same thing.......plugs,wires,coil,air and fuel filters are all new...checked the PCV hoses all look good, I'm a cancer patient and need my truck for Dr's and treatments and no money to randomly buy parts, I have seen people pointing to intake gaskets and isolator bolts...Does this motor have a track record of this being a common problem?

Thanks in advance for any insight to my possible problem

 

on a 13 year old truck, I would concentrate on external leaks first. Look over ALL the vacuum hoses. Pull one off at a time and inspect for cracks, burns, hard - not flexible.

 

Thanks steve i'm gonna try those first but I have a bad feeling it is the intake the way it slowly came about,went to pull it around to shop and it wants to die letting out the clutch i have to really raise the rpm to get it rolling now

 

check your oil level and antifreeze.. if its that bad and the gasket blew out, it might have gotten into another port also.

 

Check the hose connections that are out of sight.
The PCV elbow goes soft from the oil vapors then the vacuum sucks a hole in the soft part.
This upsets the air to fuel ratio for idle and causes the computer to close the IAC.
Result is no idle after the motor warms up.
Been there already.
Good luck.