Hi all, I have recently bought a 1998 SLK230 auto, and it seems to be down in power. It is slow to pull away and has developed a shudder when driving. I'm not sure the kompressor is kicking in either, it takes a while to gt up to speed and doesnt really go fast at all. I can hear some kind of sucking noise when accelerating but not sure exactly where its coming from. No warning lights are on. All help will be appreciated!