spark plugs going bad/gap is off
cat is getting full/going bad (doubt it)
fuel filter is dirty dirty dirty
clogged injectors
could be a lot of other things too...o2 sensor, pcv valve, air filter, timing is off,
I would try some seafoam (Im in love w/ it now) and then change the plugs and oil+filter. - read my post on how its done.
Have you been using the same type of gas?
You could also just try resetting the ecu...sometimes that helps, i guess.
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