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Emilio4980

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  1. Emilio4980
    I've checked the injectors they are both working. I've also swapped them to other cylinders to see if the problem followed the injector and no it didn't. Still have it misfires owners one and seven.
  2. Emilio4980
    I have a 08 GMC Sierra 1500 4 wheel drive with a 5.3 l in it . The problem I'm having is on the startup the vehicle seems to idle fine till it warms up then starts going to a cylinder one and seven misfire I have checked the noide on both injectors and that is fine I also did a compression test which was on cylinder one 125 psi and cylinder seven has 140 PSI. Also check the lifters and everything seems to be moving fine don't know what else to check.
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