[silvereagle07]

Well the weather finally cleared up enough around here to work on the tahoe. The more I listened to the engine I knew it wasn't the cold piston slap or a rod bearing. I ran a couple of BG fuel system cleaners through the intake and drove it like I stole it. The engine had severe carbon built up on some of the pistons that was causing the knock. After a few trips around the block it broke loose and flew out. Engine sounds great now and has more power. Thanks for all the info guys.