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I have a 2000 Yukon 5.3 liter. When its at idle, I hear a knocking in the lower left of the engine compartment. I don't know whether its a lifter or not, but I thought I might get some feedback before going to a mechanic and being charged up the ass to hear something totally wrong. Any answers?

I have been hearing a whining noise that gets louder as I accelerate, and is louder in the mornings when I start my yukon up. someone said this is my fuel pump, and said that it needed to be replaced. any suggestions as to what it is, and if the fuel pump needs to be replaced.

This is my first time posting on a forum, so please bear with me. I have been having idling problems with my Yukon for a while, but its been getting worse recently. Every time I am at a stoplight or a stop sign, it dips down to about 300, then jumps back up all of a sudden. Today, when I...