After looking at many SUVs I keep coming back to GM's Acadia. GM sure did their homework on these things a very nice unit. However I've read quite a few issues with the 3.6 engine they use in the Lambda's and other GM products. Issues with the timing chaings stretching, camshaft endplay, cylinder heads etc. I know they have built over a 600,000 Lambada's with this engine and who knows how many other vehicles.
How common are these issues? Was there certain years or plants that had the problematic engines?