Haven't been around for awhile but I wanted to jump in here also--As stated above-vacuum leaks will cause havoc with fuel metering--check and double check each vac hose--the little rubber boots on the plastic lines can look ok but still alow air by--check each line-not hard to do as a diy. The vacuum tree that all the lines come from has a rubber 0 ring I found a few years back-- It's held into the intake by a 10mm bolt. I just unpluged the sucker and used some sensor safe form a gasket and gluged her back in--no more leaks after that. The red intake gasket is crap--look between the intake and the head--if the gaskets red--change it out with the newer green gasket-you'll be glad you did--if you change the 02 sensor change the one before the cat--the one after doesn't do anything for fuel consumption. Another problem with these cars as the mileage builds on them is the thermostat that is located in the airfilter housing--that stat can go out and the only air that comes through the engine is hot air from under the hood--bad on mileage and the engine also--means that the cool air from out side the car isn't reaching the engine-most of everyone here has bypassed theirs. And lastly hello everybody-still miss my 960
Poolman