As I recall with the injector clips...just pull the rail up, put the clips on the 'rail' that has the injector connectors on them...then push it down. The clips will click into place. Easy peasy!
Glad you found the problem...and hope you figure out your CEL. If you haven't cleared codes, that might disappear after the car gets used to running without a major leak.
Upcoming NYC dates: Jan 8 and 27. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!