After you change the fuel filter, take the thing someplace where they can
pull the codes (this is the EECIV system)
Do you have idle problems? The idle should be 650-750 rpm after 1 min from
cold and should go there within few seconds from stop.
COULD be the Throttle Position Sensor among other things
IIRC, the TPS could be bad and not lite the Check Engine indicator
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