my kia sephia 1995 RPM fluctuate when I put any electrical load on iT

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THE RPM GOES DOWN QUICKLY AND THEN THE CAR ENGINE TRIES TO RECOVER IT, BUT IT STARTS SHACKING AFTER, MY BATTERY IS ACCEPTABLE AND THE ALTERNATOR IS GOOD, I CANGED THE SENSORS.. SOME TIMES IT DOES NOT START AT ALL, I REMOVE THE FUSE RESPONSIBLE FOR BENZEN PUMP AND PUT IT BACK THEN IT STARTS