2003 KIA SEDONA EX Engine And Engine Cooling Problems

WE FIRST GOT OUR (USED) KIA SEDONA OCT. OF 2007. IT HAD ABOUT 45,000 MILES ON IT WHEN WE GOT IT- AND NOW IT HAS ABOUT 74,000. 2 MONTHS INTO HAVING IT THE CHECK ENGINE LIGHT WOULD COME ON WHENEVER THE TEMPERATURE DROPPED BELOW 20 DEGREES(F). THE CHECK ENGINE LIGHT WOULD USUALLY GO OFF BY THE NEXT DAY IF IT WAS WARMER OUT OR WOULD STAY ON FOR UP TO 3 DAYS IF IT WAS VERY COLD) IT STARTED TO BUCK A LOT (ABOUT 6 MONTHS INTO HAVING IT) AND WE BROUGHT IT TO THE SHOP AND HAD THE SPARK PLUGS, WIRES, BOOTS, AND COILS REPLACED. ABOUT A MONTH AFTER THOSE WERE REPLACED THE CATALYTIC CONVERTER WENT AND WE NEEDED TO REPLACE THAT. THE CHECK ENGINE LIGHT STILL COMES ON WHEN THE TEMPERATURES DROP-BUT THEY CANT FIGURE OUT WHY. NOW THE CAR STALLS (AND BUCKS) AT VARIOUS TIMES FOR NO...

2003 KIA SEDONA WHICH WE BOUGHT BRAND NEW HAS HAD A PROBLEM ALMOST SINCE WE PURCHASED IT, INITIALLY WITH RUNNING ROUGH, THEN TRANSMISSION INTO STALLING, OR LOSS OF POWER AND ALMOST STALLING, WHEN ACCELERATING ONTO A HIGHWAY OR OTHER MAIN THOROUGHFARE WHERE RAPID ACCELERATION IS REQUIRED FOR SAFE ENTRY. WE HAVE BROUGHT THE VEHICLE BACK TO THE DEALERSHIP AT WHICH WE PURCHASED IT NUMEROUS TIMES. EITHER THEY COULD NOT FIND THE PROBLEM, OR THEY MADE REPAIRS WHICH DID NOT CORRECT THE PROBLEM. ON OCTOBER 4, 2006, MY WIFE WAS DRIVING IT ON A BUSY 4 LANE ROAD WHEN IT STALLED AND COULD NOT BE STARTED AGAIN, LEAVING HER STRANDED IN A DANGEROUS SITUATION. THE DEALERSHIP REPLACED THE POWER CONTROL MODULE THIS TIME, AND WE GOT IT BACK TODAY, OCTOBER 6, IN THE LATE AFTERNOON. I DROVE TO A DESTINATION 17 MILES AWAY AND BACK THIS EVENING. IT STALLED SEVERAL TIMES,...