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The stock honda fuel cut routine (among the civics and integras at least) is to my knowledge a function of manifold press, TPS, and questionably ECT's. That should be the only requirements.
I sealed the manifold off completely of all vacuum leaks to the point it would not idle and the problem was still the same. BUT it occurred to my in my sleep that the MAP sensor may be going bad under certain temperatures. I popped another one in and what do ya know, fuel resuming at 850 rpm now and I can get my mpg back. I've never seen a honda MAP sensor do that.
Took me a couple weeks to find it, but it's fixed now. Thanks guys
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