Cranks but will not start

We have replaced the fuel filter, EGR valve, purge valve canister. It is getting spark, we changed the crank sensor, fuel pump kicks on and there is fuel in the line. We can get it to start by spraying starter fluid into the intake manifold but shuts off immediately. At one point it had a bank 1 sensor 1 code, too lean. I'm at a loss as what to do next and hoping it isn't the timing belt. Please any idea would help.