What's wrong w/my 190E 1987, sometimes hard to start..???

[wwentzel]

Hi my 1987, 190E 2.3 16 value, has some sort of problem, it is sometimes hard to start; is is fuel injected; I have replaced the fuel pump, fuel filter, plugs, & wires, rotor button, distrubtor cap, it ran great for awhile, but then it became hard to start, & would sometimes, dies after starting & running; this was always a cold start problem; thanks any help would be greatly appreciated..Wilford