they should be intermitting, one side sprays then the other side, back and forth. if one isn't working it would be a pig on fuel and lack power,
best way to check is at idle is to stick your finger down the thottle body on the side you think isn't working and see if it gets wet, might be working but not spraying in that case it needs cleaned or replaced
if its not working check for power and ground, and replace injector if both are present
