Close
Q:

multiple cylender misfire on 2001 GMC Sierra 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
have already reploaced plugs and wires
(1) Answer
Here is just about everything you need to understand and diagnose misfire codes: http://repairpal.com/OBD-Code-P0300