1997 Oldsmobile Aurora ENGINE QUITS UPON DECELLERATION

CAR HAS HAD GOOD UPKEEP BUT IS EXIBITING SOME ELECTRICAL PROBLEMS. ABS, TRACTION AND SERVICE ENGINE LIGHTS REMAIL ON AND THOSE FUNCTIONS DO NOT WORK. MY MAIL PROBLEM AT PRESENT IS THAT THE ENGINE QUITS WHEN I COME UP THE EXIT RAMP FROM A FREEWAY OR SOMETIMES JUST WHEN I LET OFF ON THE ACCELLERATON. THIS IS SCARY AS I LOSE THE POWER ASSIST FOR STEERING ETC. DOESNT DO THIS ALL THE TIME BUT PUTS US IN DANGER WHEN IT DOES.I HAVE USED YOUR SERVICE BEFORE. HAVE AN OFFER OF $30 TO DIAGNOSE. IS THIS GOOD? THEY ARE SPEAKING OF SCANNING THE COMPUTER. I WILL PAY REASONABLE FEE FOR A QUICK AND ACCURATE ANSWER.