That may work, but I usually use a small resistor with the lead jammed in beside the pin, from the back of the connector (pin retainer snapped aside). If your meter is affecting idle, then you are either on a non-voltage range, non-d.c. range, or your meter probes are not in the right banana jacks on the meter. It sounds like you are either on a resistance or current range. Measure a flashlight battery with the meter and verify you get about 1.5 Volts, before measuring the pot. Note that the pot does not affect idle speed, but ANY false or intentional change in its output will cause a quick, temporary change in engine speed.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7