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Okay, let's fill in a couple gaps:

Diagnostics codes:
http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx


Vacuum Routing (multiple references, Toyota really dropped the ball on documenting where some of them run):
http://www.cygnusx1.net/Supra/Librar...spx?F=1708&P=3
http://www.cygnusx1.net/Supra/Librar...spx?F=2211&P=2
http://www.cygnusx1.net/Supra/Librar...spx?F=2501&P=1
http://www.cygnusx1.net/Supra/Librar...spx?F=1201&P=2
http://www.cygnusx1.net/Supra/Librar...spx?F=8717&P=1
http://www.cygnusx1.net/Supra/Librar...spx?F=8408&P=1
This lists sizes: http://www.cygnusx1.net/Supra/TechTips/vacuum_hose.aspx


TPS Inspection and Calibration:
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100

Idle Speed Controller (It's not unheard of for these to get enough detritus built up inside that the ECU is no longer able to keep a regular idle speed... cleaning is cheap and easy and may be all the fix you need):
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=106

BPV (Bypass Valve/recirculating/stock setup) vs BOV (Blow Off Valve/Dump Valve/vents to atmosphere):
http://www.toyota-supra.info/forums/...rculation.html





Yes, 23280 is the fuel pressure regulator.