Relative to the lean codes, I had a similar problem with my 2000 F-150, 4.2l. Ultimately, I found a vacuum leak. The leak was on the PCV line going to the intake manifold. You may want to clean the MAF sensor (be careful). Sometimes it becomes fouled due to residues and dirt which results in erroneous readings. A good electrical parts cleaner would work. Not sure about the misfire. I have the same on cyls 2 and 3. I suspect fuel injectors but havn't confirmed it yet.
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Wednesday, December 30th, 2009 AT 9:49 AM