1996 Dodge Caravan wont start

So, how exactly do you check the map sensor? Why would the crank sensor go out of wack again, is there some kind of vibration that would cause it, and is it normal to work right when cooled off?
Btw, I just found out when my son-in-law put the crank sensor in, he didnt use that little spacer paper, is there anything else I can use in place of it?

Ok, so I had the sensor corrected, and drove 65 miles and it started putting on me again, the code read 51, what does this mean?

I found that there was a cover off a small vaccuum, that goes from something into the intake manifold, I actually knew this was missing after I fixed the crank sensor. I went to the part store and got a cover, replaced it, and now Ive had the van running for about 25 minutes. If I just let it sit and idle for hours, will the same thing occur if that wa s the problem or does it actually need to be driven? Its been 100 degrees out and I dont want to get stuck out in bfe again.
Whta sensor are you talking about, the o2 sensor, and if so, where is it located?

Another thing, when I started it up, there was a slightly unusual humming coming from the back of the van, I think it was coming from the back, what could that be?

Its been running in the driveway for 2 hours and nothing happened. I finally shut it off. Hopefully this was the problem, what do you think?
I appreciate you so much!

Im gonna drive it today, as far as the humming in the rear end, it may have just been the fuel pumps normal sound, but I might have looked more into it because ive been trying so hard to get it running.
As far as bfe, Im originally from Bradford, my brother used to live in West Mifflin. But I usually dont tell my age but, Im 45
LOL
Ill get back to you this afternoon after I drive it. Wish me luck
lookoing froward to your reply
Marion

Ok, its me again.
I drove it today 65 miles b4 it started spitting. I stopped for about 15 min and started going again. No codes were set.
Now what?
Where is that o2 sensor located?

Good morning, Im now located in North Alabama. Small town just north of Huntsville, in Hazel Green, aka- bfe (lol)

Got to checking the van last night, I think the noise I heard was coming from the exhaust, now that I think of it, it was sounding funny b4 it broke down a month ago, I checked last night and theres not much air coming from the tailpipe, but what does come out is putting out of there. How possible is it that my converter is plugged? Btw, I remembered, while driving, about 10 miles b4 it starts acting up, it has a smell of rotten eggs, maybe sulfer for a few minutes and its when Im going up a slight hill, then it goes away and like I said, a few miles later is when it starts chocking itself out. When I got off the road, I sat for 10-15 minutes, but while I was sitting, I kept trying to give it gas and it was chocking itself if that makes sense. In a few minutes, it worked fine and I drove home

Thnaks again for everything2!

I went to the part store and got some seafoam. Put it in it blew smoke all over the engine, not much out the exhaust, so I determined the converter is plugged, Whats your thoughts?
Marion