Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
P0300 means it has detected a misfire.
P0171 refers to lean fuel mixture.
I have included some info for you that explains it in detail. Basically it sounds like there is a vacuum leak in the engine area somewhere,,,the tricky part is finding it. I suggest looking around under the hood for and loose or disconnected vac hoses. You can also take a can of carb spray and lightly spray around different areas on the engine,,,wherever there are vac hoses,,,if you come across an area to where the idle increases, there is a vac leak. If nothing found,,,unfortunatly it will have to be hooked up to a factory level scan tool to isolate the culprit.
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According to my database its classified as a LS2..
Best of luck my friend!
I just double checked and yes the LS2 has the alum block, used mainly in the corvette but could be special ordered for the Denali,,,sorry for the confusion.