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being off by .3 is a LOT especially considering closed position is at .45-.5.
It looks like the TPS is fine; it just needs to be rotated. Just loosen it; and rotate it until you get about .5 for closed position. If your TPS has the "rivets", just get a dremel or fine hacksaw and put slots in it to take it out/loosen it with a flathead screwdriver(for my brother's car I just replaced it with bolts).
Reset the ECU. My brother had similar issues with his car; every time we made a change we had to reset the ECU for it to take effect.
I'm going out on a limb here.. Checked your PCV?
What about taking the fuel filter off and emptying it on a white paper towel to see if there could be trash in it.
I know you said it was kinda new but if good, just put it back on.
Another cheap thing would be to pull the injectors to see if they look clogged too. If it's clean and shiny probably spraying good but if it's got carbon crap all gunked up around the pintle it could be suspect. Even the other end I've seen them get trash in there from a dirty fuel rail.
Have you taken off the diz-cap to see if you have the red-death in there?
I just had my d15's dizzy go out thinking it was water because I hit a few puddles and here it was coming apart on the inside. There was all sorts of black material 'chunks' all over the coil and bottom of the rotor shaft. (like if you smash a magnet)
It acted like it was running out of gas, and then start and idle fine except when i hit the throttle. Then not start for several min, then fire fine..??
Ground wires OK?
Just my .02
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I have never heard of doing this before, how do you do it?
have you checked you 2 plugs behind the intake manifold? they are 2 identical plugs. sometimes they get mixed up up. I think its the map and tps. swap those 2 and see what happens.
i would go to a junkyard and get 2 o2's from a similar year. no need to buy a new one.
Check your TPS range. It should be linear but if it's jumping around then it's a bad TPS sensor(I've had this problem before too! Though we just replaced the whole throttle body).
Also if you can, try swapping MAP sensors. Cleaning the throttle body itself is not a bad idea.