Does your car idle high and make an obnoxious racket every time you are stopped at a light, drawing dispproving looks from your fellow motorists? If you are into home car maintenance, you may be able to diagnose the cause of this problem yourself. This video illustrates how to test for one common problem that leads to a high idle, a faulty throttle position sensor, the contacts on which have been worn down by the throttle. You will need an analog multimeter to test the ohm load from the sensor and a screwdriver to stimulate the sensor during the test. Finally, your car will stop screwing up it's TPS reports.