p0305 hummer h3 in idle speed

Question

the error code p0305 occur in idle speed,hummer h3,2006

Answer 1

HI there,

This can be a bad ignition coil or a problem with a leaking intake manifold gasket. It is also possible there is an internal issue with the engine. I would swap the coil with the one next to it and see if the misfire moves as well. If it does, then replace the coil.