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Hey, I have a 2005 Silverado 2500HD 4wd and I have the check engine codes p0300, p0455 and p0449. It seems to only misfire when I go over 70mph on the highway. I found some hoses that aren’t connected to anything but probably should be. Any input or suggestions on the cause of the random multiple misfires or the large evap leak would be appreciated. I have changed the fuel cap
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