Shut off while driving does not start?

Okay, I was driving down the hwy 35 it acted like it started running on two cylinders shut off. A few people and I decided it was the fuel pump after checking the relays and replacing the fuel pump twice. I finally got pressure and it started for a couple minutes it still acted like it was running on cylinders so I replaced the coils, plug wires, and plugs. No better. I tried to get someone to stop by but couldn't. Well tried to find crank positions sensor couldn't find it it's not behind starter I found knocked and oil censors. So, another friend said something about the fuel pressure regulator well I put it off and the vacuum line attached it was a little damp. I haven't got the part frying to find a cheap one. Now my question is, where is this crankcase sensor is it in the bottomottom looks like oil or transmission pan could that be it. Now I can't see up into The back of motor nothing But a very Small crack but it's not where anything tells me it is even the repair manual says it's on the block I can't see it. I also have a Big vacuum out let on passenger side towards the firewall almost on The corner I'm guessing manifold that's got several other things. But if I would of lost or it cam off would that make it fun that bad size of a pencil but I've looked around I can not see a line disconnect at all but if it's supposed to be there what would it run and could it fall off thank you sorry so confusing getting ready to junk it's and get me another cheap car with the money. So if there's any kind of just vacuum line pictures Just for this car I'd sure like that and a picture of exactly where This crank positions sensor. I'd like picture.