What is your question?
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What is your question?
My grandson has a 2008 Chevy Silverado 4x4,5.3 cu in,we have done a complete tuneup,new throttle body,all new injectors,all new coils,this code will not go away,truck runs and drives fine has plenty of power,out of ideas,any suggestions before I take it to the shop,Thanks
What makes this problem better or worse?
truck runs fine,plenty of power
How long has your 2008 Chevrolet Silverado 1500 had this problem?
a few months
1 Reply
'Possibly' intake manifold gaskets leaking vacuum .. Testing with a *pro quality scanner* is highly recommended! It's nearly impossible to just start putting on parts and get lucky enough to actually repair these type problems without wasting a lot of money .. There are just too many possibilities for a PO300 code. In reality > Very few DIY'ers have the kind of equipment + the talent needed to successfully diagnose today's vehicles .. Suggest visiting local auto repair facility for a full scan test .. The parts stores can't help with this. Good luck with it!