2000 VOLVO V40 Electrical System Problems

2000 VOLVO V40 - VERY WELL MAINTAINED, 2ND OWNER, APPROXIMATELY 83,000 MILES. I STARTED NOTICING THAT THE CAR WOULD SURGE ON THE HIGHWAY WITH THE A/C ON AND WHEN I HAD STEADY PRESSURE ON THE ACCELERATOR (I.E. ICRUISING AT A STEADY SPEED). THE SURGE IN RPM'S WOULD BE RHYTHMIC, VERY SUBTLE (100-200 RPMS) AND CONTINUE INDEFINITELY UNTIL I TURN THE A/C OFF - AT WHICH TIME THEY WOULD CEASE. THEY WOULD SOMETIMES RESUME WHEN I TURNED THE A/C COMPRESSOR BACK ON. THIS HAPPENED INFREQUENTLY OVER THE PAST MONTH (IT'S JUNE IN CT, MY STATE OF RESIDENCE) AND WOULD NOT HAPPEN EVERY TIME I RAN THE A/C - BUT ONLY OCCURRED WHEN THE A/C COMPRESSOR WAS RUNNING. THEN A REMARKABLE THING HAPPENED TODAY - WHILE CRUISING ON THE HIGHWAY AND WITH THE A/C COMPRESSOR ON - THE CARE SUDDENLY AND VIOLENTLY SURGED IN A WAY THAT IT HAD NEVER DONE PREVIOUSLY....

VEHICLE CONTINUOUSLY IS IN NEED OF NEW BRAKE PADS. VEHICLE CURRENTLY HAS 35,000 MILES ON IT. *AK. CONSUMER STATES PREVIOUSLY THE VEHICLE EXPERIENCED ELECTRICAL SYSTEM FAILURE, LOOSE PARTS INCLUDING A WHEEL AND AIR CONDITION FAILURE. *YD