Help, No injector pulse 3 4

[luises14]

Sorry if this is resolved but ive found a few threads but no solution to problem. Have a 98 gst all stock bought a few months ago as a no start and ended up replacing almost everything got it to run and let a friend borrow it for a month and now won't start I replaced ecu and have spark, fuel pressure, but there is no pulse out of injector 3 and 4 but there is at 1 and 2. What could it be? ecu does work I put it in my over 2g and runs great.

 

[luv2rallye]

Check or replace CAS and it's wiring. It controls injector pulses along with ECU.