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Clean the electrical ground connections. I had all kinds of haywire sensor and fuel trim activity. It seemed patterned, like you are describing. I considered injectors, MAP, O2, and spark wires... in 30 mins with 210 grit sand paper, a cloth, and a little red grease, I cleaned the engine ground wire connection surfaces and those for the battery ground and the transmission ground plus a little one I found along the way... all problems vanished. I'm still in disbelief.
Given the color of the AT tranny fluid, I'll bet ground have never been cleaned.
Good luck.
james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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