My well maintained 103k mile 240D automatic recently started stalling occasionally when slowing or coming to a stop within the first 5 minutes of operation. I thought it was possibly a clogged fuel filter so I replaced both the primary and secondary filters that I had installed back in Oct '04. During this simple procedure, I clumsily leaned against the check valve on the start/stop mechanism that controls the shifting and shut off functions and broke off the 2 fittings. Of course after this, the car shifted very abruptly(I'm talking whiplash!) and wouldn't shut off without operating the stop lever under the hood. Replaced the entire assembly with a used unit and shifting calmed down, but:

The car still stalls occasionally when coming to a stop when cold and now it doesn't shut off for about 5-10 seconds after the ignition key is turned to position '0'. Before I broke the original start/stop cable, it always shut off immediately. I found the procedure for adjusting the start/stop mechanism at the injection pump in my factory service manual, but I'm still trying to figure out why it stalls when cold. My fast idle is turned all the way counterclockwise. Any ideas? Thanks.

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2002 500SL(Black/Black)
1992 300SE(Black/Black)
1992 190E 2.3(White/Navy)
1999 VW Jetta TDI(Pearl Green)
1986 SAAB 900 Base 3 door(White)
1983 Porsche 911SC(Chiffon)
1977 VW Scirocco(DiamondSilver)