My '89 190E 2.6 has 121,000 on her. She's started idling rough lately on startup. often in the morning I have to start her more than twice, because she'll always stall out at first. On the second start she'll idle, but rather rough. I'll restart her a third, then she'll idle smooth-er, but not as smooth as she used to. I only use premium, and a new fuel pump relay was installed 2 months ago. Any advice on what I can look at?