2003 GMC Envoy - Replaced gas cap without results. Where do I start looking for a vacuum leak? Check engine light is on and the meter says that it's a vacuum leak. I replaced the gas cap but that didn't correct the problem. I looked online trying to find a schematic for the vacuum system and haven't yet found it. What would be your suggestion?
Tuesday, March 20th, 2012 AT 3:38 PM