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I have a 2005 F150, 5.4 triton. I bought the truck used and it came with an Edge tuner. It's lifted with 35's.
Under mild acceleration I get a psst-psst-psst-psst-psst-psst type noise. Sounds almost like air... It only happens in drive when you get on the gas and put a load on the engine but not always. It doesn't seem to happen if you mash the pedal...
I can't seem to replicate this sound in the driveway.
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