2001 GMC Sierra 2500 HD Q&A
2001 GMC Sierra 2500 HD Question: ran codes , showing # 3 cylinder misfire .
Do a compression test to make sure the cylinder is intact. - Oakman
Need to check the fuel injectors. my friend had the same problem with his chevy 2500hd (2001) we pulled the injectors, cleaned them out with chem tool B12 spray and the problem went away. good luck! - Visitor