My 2002 blazer gave out on me on the freeway doing roughly 70, when i was able to pullover to the shoulder it wouldnt start again. Itll crank like its trying, naturally i replaced my fuel filter and checked my fuel pump as well and all is good there, it threw codes like coolant temp sensor and crankshaft sensor (the one thats under the front of the engine) so i replaced those i replaced the distributor cap and the little spinning thing under it and all the spark plugs and wire, and still nothing, i know the rotor shaft under the distributor spins cause i had someone turn the key when i took the cap off and i checked timing, but im wondering if its still got something to do with that? It was suggested to me the camshaft sensor (the one attached to the back of the distributor cap) but could that even still be the problem anymore?? Im at my wits end and kinda still need this car at least to start

 

Did you check for spark? Could be the ICM or coil failed.
Did you check the fuel pressure at the fuel rail?
What codes did you get?