Well, then you need the injector replaced. It is pricy but I would verify compression, plug and wires are working correctly.
As far as the head gasket oil leak, common in the older nissans. That too is very pricy.
Did not see the last part of your listing.
The injector is about 150 labor is 1.5 hours
the gasket set is 129 and about 8 hours in labor for the headgasket.
Sunday, April 15th, 2012 AT 1:16 PM