Question about 2005 GMC Sierra 1500 Hybrid

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What might be causing my 2005 1500 GMC Sierra to idle rough and die at stops all the sudden? I've been running an after market air intake and Flowmasters for 6mos now.

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  • Karen Leyba
    Karen Leyba May 07, 2014

    Note*no check engine light so far and it runs fine on the freeway and city streets. It only stalls out when I have to come to a stop. I've been throwing it in neutral at stops and giving it some gas to get me home and to work today.

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  • 167 Answers

Not related to mufflers, but could be associated with the CAI, but not likely. Make sure all clamps on the intake are tight and nothing has come loose from it. It shouldn't be the problem.

This could be a dirty or bad Mass Air Flow sensor, a bad O2 sensor or wiring, or a dirty throttle body orifice.

All require a degree of expertise with common hand tools, and access to the good (not environmentally-friendly) carb cleaner. If you have that expertise and don't fear tackling the job, I can assist you with instructions. It's dirty, physically difficult, and time-consuming.

Posted on May 07, 2014

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  • 24 Answers

These 4 things come to mind..

1. do you use any gas additives?
2. when was the last time you had a tuneup (with wires and plugs)?
3 Do you get gas at a particular station
4. Possible clogged gas filter.

This sounds like a "CAR TALK" question to click and clack. On most NPR stations nation-wide.. good luck.

Posted on May 07, 2014

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  • 2 Answers

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Posted on Jan 02, 2017

  • 188 Answers

SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

Posted on Feb 02, 2009

daves944
  • 1050 Answers

SOURCE: rough idle,runs fine on highway

It is possible that the regulator is leaking into the intake plenum, or one of the injector lines has a bad O-ring and is doing the same thing. This was actually a big problem with this system on the 4.3L engines, but it is a little different on the 5.7. Before tearing into this this though, I think it would be a good idea to get a professional diagnosis. I would start with a compression test. The miss could be caused by low compression in one or more cylinders. The injector assembly has the regulator mounted right on the side of it and the whole assembly resides inside the intake plenum. It is not that difficult a job, requires some patience and skill, the worst part is the cost of the parts.
I've attached a picture of the injector assembly with the reg attached and highlighted

9533d3a.jpg

Posted on Mar 19, 2009

dennymulford
  • 1055 Answers

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

  • 60 Answers

SOURCE: Rough/Low idle then dies.

is your check engine light on any longer ? also has your throttle plate ever been cleaned that can cause this symptom it will get build up on it and not allow correct idle ,you can clean it yourself ,rmove the big hose that goes up that goes up to your throttle body and get a can of deep creep sold at any parts house ,then spray the deep creep on a shop rag and by hand wipe out as much of the flap areas as you can ,its hard to get your fingers in there but be patient . but dont spray any thing down in the throttle throat it may cause more problems ,try the wipout of the throtlle area and see if it help your idle !

Posted on Aug 08, 2009

Molson02536
  • 3854 Answers

SOURCE: 95 GMC Sierra 4x4 350 5.7 rough idle problem

It sounds like a MAP sensor going bad. MAP is short for manifold absolute pressure sensor, it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly. It throws off the whole loop cycle for the computer, which in turn makes it run badly and get poor fuel economy. It can causes the engine to have a lack of power, combined with a loss of fuel economy. Poor take offs and sometimes an occasional stalling may occur if the MAP sensor is faulty and sending the wrong signals to the ECM.
Hope this helps and thank you for using Fixya.
Here is a link that my help you in the future. http://www.troublecodes.net/GM/

Posted on Mar 16, 2010

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