EGR Valve... how effective is...
#3
It really depends on the issue with it. If the diaphragm is bad then all the cleaning in the world won't help (it actually could make it worse). If it is just stuck open do to carbon build-up then a good cleaning can bring it back for a long time. The good news is they are usually very easy to get to on the GM trucks so if you do have to do it twice it isn't a huge waist of time.
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