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f150 rough idle and engine codes.

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Old 10-29-2009, 11:09 PM   #3
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Fuel pressure regulator? Pull the vacuum line off, and see if it is leaking fuel into the vacuum side.
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Old 10-30-2009, 10:45 PM   #4
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i had a problem with my 2004 5.4l stalling/rough idle, i have an after market intake. I pulled the throttle body and dscovered a lot of black greasy dirty film on the back side of the butterfly valve. a bit of carb cleaner and a towel to remove the film fixed the problem. Good luck!!!!!
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Old 10-31-2009, 12:57 AM   #5
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I had the same problem with the 5.4 and a cold air intake as well. The elbow was on a slightly off set angle and it caused me to idle like I had open headers and stall out at red lights.
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Old 11-03-2009, 03:39 PM   #7
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The 2000 thru 2003 4.2L has a TSB about the isolator bolts securing the plastic plenium chamber leaking causing the two codes. Its a pricey fix, about $150.00 for the parts. Takes a good 2-3 hours to do. Its not hard, just awkward to get at some of the crap. Note, the firewall sound deadener nees to be cut by the heater hoses for more clearance. Give me a PM if interested in more info.
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