why does my truck idle at around 2000 rpm's but only when my pedal position sensor is hooked up?

2000 CHEVROLET SILVERADO
130,000 MILES
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PICO1022
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my truck was throwing the p0122 code for position sensor so I put new sensor on my truck but was still throwing the code on my vehicle and as i was checkin the wires to see if there was a short my truck started idling at 2000 rpm's and so i unplugged the wires and my truck ran really good. i checked the wires on my vom meter and they all seem to be working right and i also changed the computer but nothing is making it idle right with it plugged in.
Feb 2, 2012 at 1:15 AM
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JACOBANDNICKOLAS
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Check the idle air control valve and the throttle position sensor
Feb 2, 2012 at 1:21 AM
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PICO1022
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I checked the throttle position sensor and is showing as working properly. My truck only idles high whenever the position sensor is plugged in. When i unplug it then it idles fine. Could it still be the idle air control valve doing it?
Feb 2, 2012 at 1:44 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
I would pull it out and check it.
Feb 2, 2012 at 2:25 AM
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