Crank Shaft Position Sensor on 1990 Dodge Ram Van B350

I'm trying to find the crank shaft position sensor and have yet to locate it,the van will fire sometimes but then die.Not sure what it is but process of elimination has led me here.Thanks

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2 answers
on my dodge van it's found where back of motor & trans meet on passanger side
held in by hex bolts
Does not sound like that is your problem. But I will tell you that year does not have a crankshaft position sensor or cam shaft sensor. It has one that does both it is in side the distributor. It's called a crank angle sensor. Good luck to you.