idle

2003 GMC SIERRA
132,100 MILES
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JJKENJO
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  • 4 POSTS
When im sitting at a redlight the truck idles at 300 rpm when I touch the gas it will die. I have replaced throttle position sensor, mass air flow sensor. Found no vacuum leaks no service engine light. What could cause the truck to do this
Apr 27, 2013 at 3:18 PM
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MHPAUTOS
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  • 31,937 POSTS
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Base idle is way to low, have you checked the IAC as yet? that is the idle control motor.
Apr 27, 2013 at 4:51 PM
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JJKENJO
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  • 4 POSTS
It's made into the throttle body my truck has a 5.3 v8 t model no egr valve
Apr 27, 2013 at 6:37 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Have you checked it yet?
Apr 28, 2013 at 12:35 AM
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JJKENJO
  • MEMBER
  • 4 POSTS
Its good checked the fuel pressure it is at 30 psi
Apr 28, 2013 at 9:16 AM
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