2004 GMC Envoy vibration while idling

[Greasemonkey]

Re: The possibility of an injector issue, would the engine not throw a trouble code of some sort indicating injector trouble?

Checking the brake booster hose and pcv hose are good quick tips (I do believe I read elsewhere that it's possible that the brake booster and/or its hose are possible vacuum leak points). I'll check them out tomorrow when I get the chance.

Thanks so much again. Hoping against hope for the cheap and clean fix!

[ProTech]

Usually, yes it will set a code. I'm really doubting it's an injector, though.