I have a new to me, 2002 SLK32 with 80k on the clock. When pulling away from a stop with lite power, the trans engages smoothly and after about 2 seconds it "bumps" in second gear as if you released the clutch abruptly on a manual trans. Is this normal behavior? Once fully warmed up it goes away, or if I'm on the power moderately or hard, it isn't noticeable. I just replaced the trans fluid per the Forum instructions and it shifts a little smoother but the "bump" is still there on slow acceleration. It's not bad, but there. Should I be worried?