If it cranks but doesn't start, it's probably a fuel problem or ignition problem. Check the filters, gas gauge, ignition fuse, ignition relay, fuel pump. Turn the key to on while having your ear next to the fuel pump(may require 2 people or really really long arms) and see if the fuel pump primes. If not, that will cause it. If the fuel filters are clogged and it's not getting fuel, that will cause it. If there's no spark, that will cause it.