'90 Civic 1.5 - Compression good all cyl. Fire good all cyl. Starts but runs rough with cyl 1 and 3 (rt to left) dead. I can pull plug wire on either or both with no effect. I can disconnect secondary injector ( bottom ) with no effect. Disconnect top injector and it dies. Connected secondary inj. Wire to primary and it popped and backfired, timing, so I think the wire to the secondary is good.
QUESTIONS:
Does primary injector fuel all 4 cylinders?
Is there an easy way to test the secondary injector.

Thanks in advance for any help. This is my idiot grandsons car and the faster I get it running the faster I can get him out of my face.

My email is [email protected] Thanks, Bob Ritter, Pensacola, FL