I am checking for spark on all my spark plugs and I currently have all of them out, attached to each spark plug lead, and grounded. I removed the EFI relay and 20A fuse under the hood, but upon cranking it seems like maybe the removal of the relay and fuse has not only disabled fuel, but also spark. I just want to disable fuel while checking spark. How can I do this? I have a 1993 LS400.