I have fixed this problem on mine but not on purpose. When I replaced my injectors I all so did the fuel distributor, injector lines, fuel pressure reg. and check valve. I did all of this because I had a bad idle that would not go away. When it was all said and done the car ran great and it starts on the first try anytime. I would start with the injectors first, the worn ones have a tendency to leak down when parked warm. Hope this helps!

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Mike

90 300D 511k
95 C280 133k
14 BMW 528i