Before attempting this action... Please be prepared to Fully Investigate and Repair problematic Wiring Harness connections prior to doing this Test
which MAY make the situation WORSE:
Tools and Supplies at the Ready:
(1) Scope On A Rope - Lighted Continuity Probe.
(2) DMM or DVOM.
(3) Automotive Grade Wire Heat Shrink Insulators.
(4) Black Electrician's Tape.
(5) Soldering Kit with Gun & Rosin Core Silver Solder.
(6) A Bright Flashlight.
(7) Various Colored 6" Long Automotive Wires.
(8) ,... Better Yet, Obtain a Replacement Harness Connector.
(...around $10.00 on Amazon):
(9) Having this Inexpensive Broken Wire Probe Kit would help you to locate and isolate any Broken Wires and there are quite a few Training Youtube Videos to demonstrate just how handy it will be:
With the 4L60e Shifter in PARK and the Emergency Brake SET, Start the Motor and allow the vehicle to idle for a few minutes and warm up. Then address the
Wire Harness leading to the Throttle Body Connector and gradually move them around it slow, small semi-circular motions and observe and listen carefully for the slightest signs of any Engine Stall or sudden increase in RPM.
If your actions can cause this to occur, clear the Work Field, lay down a Wide Work Towel. Then carefully un-wrap the OEM protective coverings
in a non-destructive manner from around the TB Harness Wire Bundle.
As the Engine Idles around 600-650 RPM... attempt to repeat the RPM Drop Event by Slightly, LIGHTLY pulling on One Wire at a Time right where each Wire enters the back side of the Weather-Pack Connector and gradually work your way along each wire ...very slowly. If the Engine Sputters and Stalls... focus on that Single Wire-Connector point.
Be aware that while Only One Wire should be repaired at time, MORE than One Wire may be involved.
In some cases, the Light Pulling Action will be enough
to completely separate the Sketchy Wire Hidden INSIDE of the Wire Insulation. Naturally, an On-The-Spot Repair would be called for and so having the necessary Gear prepared and on hand will move things along without delay.