You might check the thermo-time switch and the cold start valve. The switch is supposed to shut off the valve after a short time. It may have failed. If it is OK, then the valve may be leaking a bit of fuel when it should not. You might also check the cold start relay, it is rely #2, the first one on the top on the right in the relay stack. They are located up beside the fuses in the passenger footwell. All this is described in job # 07.4-125 in the CD ROM manual. The manual is cheap, $19.99, from MBUSA; check their classic technical literature section if you do not have it already.

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