Rear primary not firing on a s5 89 t2 with a n374
 

Has anybody else had a problem like this. It is a s5 t2 car and the rear primary injector will not fire. I Have tried two n374's and the same thing. Kevin at rotary res. say's he heard of this problem but He has never seen fit. He says that it iwll be fixed with a n370. I need any advise on this. Please let me know any ideas. thanks