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Rouch idle when accelerate after Morning start

Tiny
ARIEL
  • MEMBER
  • GMC ENVOY
My 2002 GMC Envoy has 106,000 miles on it. When I turn it on (morning or after long time being off) it will idle fine and drive fine, but when I drive from parking lot and come to a stop soon at end of parking lot, it will idle very rough. This is the only time it will happen, and idles smoothly all other times. This problem has been happening for the past 10k miles

I have changed spark plugs, fuel filter, and have done a complete fuel injection cleaning, where fluid sent directly to injectors, throttle body cleaned, and treatment added to gas tank. I only use high quality gasoline, and keep maintenance regularly.

Please help with any and all suggestions

Thank you

Ariel
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Friday, April 14th, 2006 AT 11:12 AM

2 Replies

Tiny
LOSONE
  • MECHANIC
  • 1,616 POSTS
Sadly you have a Vortec system. All of the injector components are buried inside the intake manifold. Sounds like either the fuel pressure regulator or one of the plastic lines leading to the injectors is bad. The unit is over $600.00 and a pain to replace. Good luck
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Friday, April 14th, 2006 AT 11:18 AM
Tiny
HUNTER
  • MEMBER
  • 11 POSTS
Check you vacuum lines especially from the fuel regulator. Any leaking line could cause this. Also, check the plastic tee's to see if any are cracked.
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Friday, April 14th, 2006 AT 4:39 PM

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