Quote Originally Posted by green91
Yes, if you have low compression or a misfire either one on a bad cylinder is will more than likely throw a misfire code causing you to fail emissions. it will typically have poor idle if there is a misfire.
again not all the time while it throw a check engine light on a dead hole . . but mostl likely make you fail emmsion. misfires yes but sometimes if there to eratic will it onyl throw a MIL. misfires are normal on engines but happen very few times .