I have a 1995 Nissan Altima, gas/automatic transmission, 2.4L, GXE that cranks but won't start. This problem started back in 2014 when all of a sudden the car started dieseling and trying to die. We think we have fixed it, then the crank/no start returned, replaced more stuff, etc. Since April/May of 2015, car has not run regardless of repairs. So far we have: March 30 2014 Replaced ignition coil, ignition rotor, distributor and ignition wire set. May 1st, 2014--Distributor, again. March 12, 2015 Ignition Coil (2nd), also rebuilt the generator and replaced the fuel filter. May 28, 2015 Elec Distributor, EGR valve, valve cover gaskets, spark plugs
, plug wires, fuel pump and fuel filter, again. July 2015 Replace Coil again (3rd), throttle position sensor, and sent ECM off for repair/reman. Each time we do something, car will start, sometimes run for awhile, then next time will crank but not start. We have checked voltages, wired around components to check things, etc.--What are we missing?