1997, f150 4x4 5.4v8. 240,000 miles. The truck is revving at an idle after I let off the gas. Its showing a p1132 & p1152 codes. I replaced both up stream o2 sensors. And the problem did not go away. For some reason the fuel pump relay went bad and I replaced that. I replaced the fuel pump and the fuel filter. I replace the PCV valve and the IAC. I reset the computer and drove it to reset it. Now the new codes I am showing are the p1132 and the p1152 again. She is still revving and I'm not sure what's going on. I really appreciate some advice if anybody has any ideas

 

I don't know if this is just stuck in my head or what, but a lot of symptoms in recent threads seem to point to bad brake booster.

If you're sitting at a stop, in Park or neutral, does idle speed change when you step on the brake pedal? That would give a vacuum leak which could raise idle speed and cause a lean situation, which is apparently a possible cause for those codes.

Another possibility for RPM hanging high is a stuck throttle blade. Dirty throttle body. But that should cause those codes.

 

I will check that out and post back what I find. Thank you