Hi all

I have a 1987 w126 300se think M103 engine with a cold start problem which is just getting worse and worse.

The engine just turns over and over and over and then spluters into a missing start, then runs lke a dream once started. Following that the stating improves and when hot it starts as it should do.

Is there some sort of cold start sensor? I know there is a sensor on the top of the engine block at the rear which was replaced about 1000miles ago due to the car cutting out at juctions or stalling when hot which sorted that probelm, then this one has started?

Help apprecated