Electrical issues.. lights dimming, then engine started to stall while driving and engine lifters started ticking and is getting louder... no fault codes were found by dealer when checked... and cannot reduplicate elec. issue and stall .. but has happened 3 different times over a 2 yr period and now the lifters are clacking very badly...my vehicle gets reg. oil changes etc. and according to all the forums this is a major problem with this vehicle... a tsb bulletin has been announced by gmc but no recall.. are they waiting til someone dies for a lawsuit. *tr