My 300SD is incredibly slow first thing in the morning until the temp gauge reads 60 degrees (C). It gets better after that, but I dont know what 'normal' feels like as I just purchased the car about a week ago. Could this be a sign of boost pressure or injector timing being out of adjustment? I replaced the filters and I think the new air filter may have helped a bit. I also plan to adjust the valves. Any advice is apprecieated. Thanks