I think I've traced down my vac Leak to my cylinder 5 fuel injector. I replaced my lim last year (twice) and I've been occasionally dealing with a vac leak at around +12 LTFT and I was spraying carb cleaner and once it hit the injector it dropped to -2 LTFT. During removal last year, I pulled the fuel rail off and the injetor nylon collar that goes into the head broke. I reinstalled new zzp o-rings and used synthetic grease to install them. I think the o-ring might have moved upon installation and that is where I'm getting my vac leak from.
Anyone know where to get a replacement nylon collar or they call it a backup o-ring (Helms name) for oem L67 fuel injectors?
Here's is a picture of our injectors (i need the bottom nylon piece which hold the viton o-ring in place
http://www.2carpros.com/forum/viewtopic.php?p=126867