I'm working on my buddies 91' EF. Its a A6/Y8 mini me, and he has been using the A6 manifold for awhile. I sold him a Y8 today, and attempted to put it on. Everything went smooth. Until start up. Starts right up with no problem. Has an erratic idle 1200-1700. But after it reaches 1700 and drops down, you can hear the main relay clicking. Each time it drops RPMs. So we pulled it out of the garage and onto the other side, and when you go it will studder then try to die. We are using the MAP sensor for the Y8. Manifold is off of a 99' i believe. Car is still OBD0. Any ideas? Thanks again guys in advance.