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Message: <blockquote data-quote="ORVietVet" data-source="post: 22144" data-attributes="member: 9438">Welcome to the forum, from Oregon.In no particular order, First: Is there any CEL? Second: Age of ignition related components? Third: What do the plugs look like? May need to pull plugs and keep in cylinder order and post pics of the business end. Fourth: While plugs are out, do a compression test. Fifth: Before plugs removal, attach a Live Data scanner and see what the readings are for long term and short term fuel trims. Need to monitor O2 sensor activity. Sixth: Need to know what the fuel pump pressure is. Can attach a long enough hose to the gauge and run hose out the back of the hood and tape to w/s and see what the fuel pressures are during different load conditions.The key will be if you have any CEL. Check Engine Lights. That can help pinpoint a single cylinder if is the culprit and also if is fuel trims or sensors related.I have a 2004 Chevy Silverado K2500HD 6.0, so I have a personal stake in this outcome.Had you done any previous work on the truck before this problem? Had any shop look at it yet?You said, "having a hard time finding the problem with it", so that leads me to believe you have done some research or attempted some work on it.You may have a pcv system problem and need the valve covers replaced. There are updated valve covers out there for pcv problems related to the original valve cover/pcv design.</blockquote>