Car wont start right away

Hey guys my c200 doesn’t start right away it
cranks but doesnt start. I usually do it a
couple of times and then it starts. I went to
repair shops and some told me its fuel pump
others say spark plugs and others say engine
sensors. I replaced spark plugs and still has
the same problem. Does anyone know a
solution of this problem or has happened to
then and fixed it if so please help me. Thanks