Our '97 960 has started running rough and has confused at least two mechanics. The first one replaced the MAP sensor and one injector. The second wanted to replace the ignition coils since they had small cracks. I tested this out by replacing one coil on the cylinder with a misfire - no change. He also checked the intake manifold for leaks and found none. This guy is a Volvo specialist. I checked for intake leaks with a spray can of injector cleaner; it seems to be leaking around the first two (maybe three) intake manifold sleeves and other places. One place that acts like it is leaking is under the intake manifold but I don't know that there any vacuum lines under it. I would like to find a vacuum diagram before I take the intake manifold off and replace the sleeves.
Any ideas?
Gary