anyone have a vibration sound when you start your malibu? I took a 600 mile trip last week and it started while there. does it for like 3 sec. after engine starts. sounds to me like it's coming from the top end of the engine. called dealer since it's still under warranty. They say it sounds like I have a lifter bleeding down. I did happen to notice on 2 seperate ocasions a cobalt and a cavalier making the same sound the cavalier didn't stop though. I had a '81 mustang and had a similar sound and it was a lifter but it also had 125,000 miles on it, my '07 Malibu only has 52,000. Seems kinda early to me. At any rate it's still under the 5 yr/100,000 mile powertrain warranty. Just wondering if this was a common thing.
