Engine Stall, Multiple Codes What to attack first..

[redsvx94]

Hello,

In this morning, I found my 94 SVX LSi (~140K miles) engine cranks but does not catch the fire. In recent days, engine occasionally died on idle before it warmed up, but never after warm-up. I have not used the car for 4-5 days and now it doesn't start. The check engine light codes are

11 crank angle sensor
16 Fuel Injector no 3
19 Fuel Injector no 6
32 Oxygen Sensor or Circuit No.1 right side

I have noticed that 11 has appeared intermittently before but at that time I didn't have other issue. Kind of suspcious whether all three parts break down at the same time.
What would be most efficient course of action for me?
Thanks!
-John