I wanted to see if anyone else was having issues like this or knew anything about this. I have an 04 Colorado with the 2.8 L, that I just bought so I dont know the service history. It idles really bad like there is either a vaccum leak or something along those lines. It is worse when you are coming to a stop and let off the throttle. It never dies though, just seems like it might. The other day while this was happening the oil light came on and a chime went off. When I stopped to get fuel I went ahead and checked the oil level. On the dipstick the level was full, but it was "foamy" like there was water in the oil. I am thinking this might be a sign of a leaking head gasket. If this is the case I am wanting to find out if anyone has ever dealt with this and to find out if these trucks have a problem with the heads cracking or is this something that I can just pull apart and send the head to be milled and then reinstall with a new gaskst. Any help will be greatly appreciated. I am a BMW mechainc, but I have never dealt with these trucks. So I do have mechanical knowledge. I am just trying to find out if this is a common occurence or anything really.