I HAVE A 93 LUDE SI..WHILE IM DRIVING THE ENGINES START THE SPUTTER AND THE RPM NEEDLE JUMPS UP AND DOWN ..I LOSE POWER WHILE THIS HAPPENS AND THE CAR DECELERATES QUICKLY...SOMETIMES IT DIES OR IT SOUNDS LIKE IT DIES UNTIL I HIT THE GAS HARDER... IT SOMETIMES BACKFIRES...THIS ONLY HAPPENS WHEN IM AT A CRUISING SPEED OR WHEN I TAKE OFF ...RECENTLY THE ENGINE TEMP STARTS OUT A QUARTER OF THE WAY WHEN I START IT COLD...WHAT COULD IT BE...?

I CHANGED THE FUEL FILTER ALREADY... I HAVE NO IDEA WHAT IT COULD BE..

 

I'd start with a tune up and don't post in all caps. Might also check your ignitor.