j mac08

it started with my car just stalling out of nowhere while driveing down the highway at 70mph then it would take 20 minutes to fire back up but it just died no spit or sputter just died then i replaced the feul pump and the ignition mod. it seem to run fine put 100 miles on it no problom went in the grocery store came out and it wouldnt start finaly got it started after 15 mins then i started to drive took it up to 3000rpm and it just died again but there is no check engine light on ,i thought it was burn out but it comes on when you turn the key but once its strted it goes off. someone told me a crankshaft sensor.and now i cant get it to start at all. but i dont have the money to keep guessin any suggestions