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Re: Missing after WOT???
The piss poor mileage *might* have something to do with an O2 sensor - might be worth checking out. The engine computer will use this data in conjunction with the MAP sensor to determine the appropriate air/fuel ratio to send to the injectors. Once your idle problem is fixed, if mileage remains poor, I would look into testing these two sensors.
As far as the idle is concerned (and after thinking about it, this could be causing the initial symptom you were describing as well), I'd be looking toward the Idle Air Control (IAC) valve, as the symptoms you describe are sometimes the result of a dirty IAC valve and/or vacuum leaks.
Finally, might be good to just verify proper fuel pressure at the injectors. I have an older rig w/TBI, so not sure on the spec for you.
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2003 Honda Odyssey EXL (3.5L)
2002 Volvo V70 X/C
1990 Chevy Silverado K2500 (5.7L TBI)
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