2007 Toyota Sienna won’t start intermittently

Hey guys

My number one problem is the car will not start occasionally… the only way to start is use starter fluid. We spray the starter fluid it kicks but dies not run until we fully assemble the air cleaner… then the car may start every time for a few day then out of no where it’s doesnt start

We put a new fuel pump which did not fix the problem

One other thing I believe u should know… When I accelerate hard the engine cuts off the restarts when I release the gas pedal

I am baffled

I’m handicapped and drive from a wheelchair so this is the only vehicle I can drive… any suggestions would be Greatly Appreciated