If you have the V6 it could be a bad pre-cat.
Does it sound like a bell ringing? That's what mine sounded like when it went bad.
Dueling Duratecs
'95 SE V6 MTX 0 Mods
'04 Mazda6 S Wagon
'03 Kawasaki Z1000
But thus do I counsel you, my friends: distrust all in whom the impulse to punish is powerful!
Friedrich Nietzsche
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