2006 BUICK RENDEZVOUS Unknown Or Other Problems

I PURCHASED THIS CAR AND EVERY SINCE I'VE REPLACED MANY TIRES, TIE RODS, ELECTRICAL ISSUES, SERVICE ENGINE LIGHTS, MAF SENSOR, DOWNSTREAM SENSOR, MY MECHANIC HOTWIRED MY FUEL PUMP LINES WITH A 50 AMP FUSE TO FUSE BOX, BATTERY DYING, ALIGNMENT ISSUES, CAR DYING ON HIWAY OR ANY STREET, GAS GAUGE ISSUES, YOU NAME IT... DROPPED A LOT OF MONEY FOR A CRUMMY CAR, THIS WAS MY WIFE'S BIRTHDAY PRESENT THAT HAS A MIND OF ITS OWN. MY MECHANIC AND TRIPLE A BOTH LOVE ME... HAH. DO YOURSELF A FAVOR... STAY VERY FAR AWAY FROM THIS CAR.......

I'VE HAD SO MANY PROBLEMS WITH THIS VEHICLE. SPENT OVER $4000 IN REPAIRS IN THE LAST 6 MONTHS. THE FIRST PROBLEM I HAD WAS WHILE DRIVING ON THE HIGHWAY THE REDUCED ENGINE POWER LIGHT AND TRACTION SYSTEM LIGHT WOULD COME ON AND THE VEHICLE WOULD JUST DECELERATE AND WOULDN'T GO OVER 15MPH. I HAD IT REPAIRED ONCE AND WAS TOLD IT WAS THE WIRING HARNESS AND THEN 2 MONTHS LATER THE SAME THING HAPPENED AGAIN HAD IT REPAIRED AND WAS TOLD IT WAS THE WIRING HARNESS AND COMPUTER THAT NEEDED REPLACED. AND NOW I'M HAVING A SIMILAR ISSUE BUT THIS TIME THE SERVICE ENGINE SOON LIGHT IS FLASHING BUT THE CAR DOESN'T WANT TO ACCELERATE AND TAKES SEVERAL SECONDS TO EVEN GET UP TO 35 MPH. I HAD THIS REPAIRED ONCE AND WAS TOLD IT WAS A WIRING/FUSE ISSUE AND THAT THE CAR WAS ONLY RUNNING ON 3 CYLINDERS AND...