2001 GMC Sierra 2500 HD Q&A

2001 GMC Sierra 2500 HD Question: ran codes , showing # 3 cylinder misfire .

changed plugs, wires and fuel filter and still no change .any help would be grateful . thanks -
Answer 1
Do a compression test to make sure the cylinder is intact. -
Answer 2
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! -