Question about 1990 Cadillac Eldorado

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1990 CADDY ELDORADO; SERVICE ENGINE LIGHT CAME

1990 CADDY ELDORADO; SERVICE ENGINE LIGHT CAME ON, CAR STARTED RUNNING VERY ROUGH, NO POWER, NO PICK UP, POOR GAS MILEAGE. DID A CHECK OF DRIVERS INFOMATION CENTER AND GOT CODE OF ''E032'' (OPEN MAP SENSOR CIRCUIT). CHANGED THE SENSOR WITH NEW SENSOR (DURALAST SU104 SENSOR) . RESET CAR'S COMPUTER.
HOWEVER, THE PROBLEM IS STILL THERE, LIGHT STILL ON, CODE STILL SAYING ''E032'' AND THE PROBLEM IS GETTING WORSE, WHERE CAR GOES DEAD WHEN AT COMPLETE STOP IN GEAR.
ANY IDEAS? (THE BOX THAT NEW SENSOR CAME IN FROM AUTO ZONE HAD BEEN OPENED, COULD THE NEW SENSOR BE BAD OR A USED ONE SWITCHED BACK INTO BOX BY PAST CUST?)
I ALSO HAVE CHANGED THE PLUGS AND FUEL FILTER, THOUGHT I GOT SOME BAD GAS, BUT TOOK A TRIP ON WEEK END AND BURNED THAT OUT AND NOW FRESH GAS, BUT SAME PROBLEM.
CAR IS IN EXCELLENT CONDITION, LOW MILES, WELL TAKEN CARE OF...ANY HELP OUT THERE....

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You see electrical parts do not return .

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