I have a 07 Aspen 4.7 flex. Went to get in it go to work it would crank but never start. So we sprayed ether in the intake and it started and will run. If you shut it off it won't start again unless you spray either in the intake. We have changed the fuel pump, tps, cam pos. sensor, checked all fuses and relays. After we changed the fuel pup and sensors it would start then we had heavy rains come in and on my way home it started acting crazy again. Felt like the transmission was going out would shift. Got home and wouldn't start again unless you use ether. We have since changed the ignition switch. Still the same. Any ideas or advice would be greatly appreciated