disclaimer *I do not know that car at all.*
Has power declined as well as mileage?
Have you ever changed EGR or PCV valves?
How about the O2 sensor?
How does the air filter look? Don't worry if it's within 20K of new, but if it's full of mud it could cause problems.
Smell the oil. Any hint of gasoline? You could have a leaky injector which would lead to other bad things.
You could have a bad temp sensor or other leading to a rich fuel mixture. (it would always be in "warmup" mode)
Can you stop by an Autozone or other for a free diagnostic? They plug into the OBD system and dump codes. '96 means OBD I but it can still tell you about important things like emissions (mixture, exhaust content) depending on the car.
(duck - I'm throwing darts blindfolded)
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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