Balancing the throttle bodies is easy with the [TuneECU] software and a screw driver. If you have the stock air intake plumbing you might either opt to remove the plastic ducting or if you can get a 90 degree screw driver on the screws you could leave it on. Either way #1 and #3 are the ones you actually adjust by the adjustment screws in between the throttle bodies. The engine should be at operating temp. Before you do this job I would also clean all the springs and linkages on the throttle bodies with WD 40 with a straw on the end tol loosen up the dirt and grime and blow it out and lubricate things at the same time. Below are some pictures that might help.
The adjustment screws on the throttle bodies between #1 and #2, and then the one between #2 and #3.
Note the springs in between these get the cleaning I was talking about.
Below is the spring and throttle roller the cam rides against. theses get spray cleaned and lubricated.
another shot of the spring on the front throttle body.
Spary, clean, and lubricate the stepper motor shaft. This is easier if you extend the motor the .12 volts during the ISCV rest function. That way it is easier to drop the rubber boot and spray with WD 40.
When you get them balanced, say there are 10 points between them or better, blip the motor a couple times and let it come back to idle and evaluate the balance, and adjust if needed. Do this a couple times until fully balanced, then do a full ISCV reset
Hope this helps some!!!!