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1) TPS doesn't have to be exact. You could even unplug the thing and other than a wonky idle the engine will run pretty much normal. Any 7M that doesn't has something wrong with it. 2) Check for codes, particularly air flow meter related ones (the engine does not have a MAF).

A faulty AFM will limit rpm to 3K. A faulty TPS will not. Course, for the AFM to cause it code 31 would normally be set. As for the TPS resistance, that's normal. What you're setting is nothing more than a single pole switch, as clearly depicted in the service manual. edit: beaten by Indigo...

^ That, although it's more telling the Keep Alive is dead...

Yeah, you could use the stock boost sensors. Should be able to find 'em cheap on ebay or a junk yard. Motorola pressure transducers from Mouser/Digikey, et al will also work. The DATAQ software allow for input scaling and all their loggers I worked with have integral supplies for powering...

Lots of stuff out there. Back in the day I liked DATAQ. Some of their low cost offerings: http://www.dataq.com/data-acquisition/starter-kits/ Try and get get something that does differential for the intercooler efficiency. Simpler to deal with than two measurements, especially when monitoring.

It's not the reluctor coils. And why would you pull vacuum on the thing? That'll only make the problem worse. Lastly, the dizzy isn't airtight to prevent O3 induced corrosion.

^ Crack me up. Too much Dunning-Kruger for me. I'm out...

B1 goes to what it says in that link although the TEWD is a better reference that should be consulted instead. 17 should have continuity with 12. Again, the schematic makes that clear. "A little continuity?"

Set the timing after first fixing 51 because timing can't be set when IDL isn't working. That said 51 can be caused by other than the TPS. Other than idle control and an emissions function (which may be related to your after-fire/muffler explosions) a TPS related 51 doesn't have much effect...

I'd have thought most people would look into this prior to importation. If you do not qualify for any of the exemptions on Form 256F you're SOL. Look on the bright side: you saved $2500...

He's right. Can't have spark with NE hard to ground. Even Supra owners can't change the laws of physics. That means there must be another explanation...

Why I decided to pass on unification...

You make all that out to be conclusive. It's not.

^ That's great post. If only all those seeking help could be like that. I don't have much time right now but your assumption about needing another AFM is very likely correct.

First, if the code remains when the TPS harness pins are shorted the wiring would have to be bad. Second, the most accurate way to determine the cause of 51 is to measure each of the three inputs on the ECU to find which is, literally, at fault

^ In the interest of accuracy a couple of things. First, oiled gauze filters can contaminate the Karman sensor used in a GTE. Second, the statement regarding O2 sensor checking is incorrect. It it were true the entire reasoning behind OBD would be invalid.

Unshielded wiring. Yeah, that'll work...

As Nick said, what are DTCs if any? I see no mention of them even being checked for in that long OP. Second, if you're using a lambda sensor (and I'm assuming you are) to look at AFR, why do you think no spark = rich mixture?

^ Great post. K&N works so well they sell a sock "prefilter" to put over it when the air is dirty...