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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: manitobamike on November 19, 2010, 10:43:26 am
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was wondering if anyone had an idea what would make my truck run rough when its cold and it back fires a couple times after i start it , but after idling for about 5 mins it smooths out and is fine! could it be the egr valve?
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The problem with EGR systems is most commonly caused by the GR solenoid sticking allowing vaccum to apply the EGR. you don't want the EGR open at idle even just a little bit. A simple way to determine if this is the problem is to unplug the vacuum source at the EGR valve.
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thank you very much