Just cut off when backing out of the parking lot, I changed the cam and crankshaft sensor, spark plugs, fuel filter, it is getting spark, change fuel relay. could it be my fuel pump? it is pumping fuel, I have a knock sensor code,need help bad, It will crank when I put starter fluid in, but cut off, it turns over strong, but wont crank on

 

You may be immobilized now. It turns off the fuel injectors.

Is the red security light on all the time?

 

Knock sensor will not prevent your car from starting.