Crankshaft position sensor

It is a 1992 Winnebago brave motor home. Some times starts, sometimes cranks but does not start. There is spark to every spark plug, there is good fuel pressure (new fuel pump). The times when does not start it sounds like there is no compression or like is out of timing (louder and faster sound when cranking.)

Question: Do this motor has a crankshaft position sensor? Vehicle chassis is an F53 with a 7.5 engine fuel injection auto transmission. When it does start the motor shakes and misses an throws a little black smoke through the exhaust. Thank you in advance for any help.