Looks to me like either the harness problem or mass air flow sensor problem. With problems like this the multiplicative vaules set in the DME are usually pegged at 12%, so I swap with a known good MAF and drive it a few miles... if the multiplicatives start coming back to normal range you know you had a bad MAF. If that don't do it.... harness time. (since you fall within the bulletin range, you likely need that damn harness)

And FWIW I would use some MAF cleaner from autozone instead of WD40 on that MAF sensor... the oil film will fudge the readings and make you run more rich vs the cleaner that will remove the film and leave it perfectly dry with no residue.

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2003 4.6is