changed plugs, wires and fuel filter and still no change .any help would be grateful . thanks
GMC Q&AAsk Your Question
2001 GMC Sierra 2500 HD Question: ran codes , showing # 3 cylinder misfire .
Answer #1Oakman March 05, 2010, 13:47Master
Do a compression test to make sure the cylinder is intact.
Answer #2Visitor, April 17, 2010, 20:23
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!