The "Gordon" trick is the re-grounding of the SIR sensors. In the top picture you can see the small black box with the yellow wiring coming from it. The evap box leaks water on to the frame and the eventual rust causes the sensor to loose the ground and set an SIR DTC, thew infamous INFLREST light on the DIC.
Gordon Killebrew (sp?) said to unbolt the sensors, clean up the corrosion, use a star washer and some dielectric under the mounting tab and clear the code.
http://zr1netregistry.com/Old_Proj/old_proj7.htm
The one on the driver's side is just in front of the battery tray.
Tom