2003 DODGE SPRINTER Electrical System Problems

I PURCHASED A 2003 DODGE INTREPID IN NOVEMBER OF 2005 AND THE CAR RUNS FINE UP UNTIL ABOUT A MONTH AND A HALF AGO. THE CHECK ENGINE LIGHT CAME ON AND THE CAR WOULD GET STUCK IN ONE GEAR AND MY RPM WOULD GO UP INTO THE RED LINE UNLESS I PULLED OVER AND RESTARTED THE CAR. OTHER TIMES IT WOULD GET STUCK AND THEN JERK INTO THE NEXT GEAR. THEN ABOUT FOUR DAYS AGO I WAS ON THE FREEWAY AND THE WHOLE CAR JUST SHUT OFF. I COULD NOT MOVE IT AND TRAFFIC WAS SPEEDING PAST ME AND A FEW HAD TO SLAM ON BREAKS TO AVOID HITTING ME AND MY TEN MONTH OLD DAUGHTER. I HAD TO HAVE SOME PEOPLE HELP ME TO PUSH IT OFF THE FREEWAY SO THAT I COULD RESTART IT TO MAKE IT BACK HOME. I AM VERY FRIGHTENED TO DRIVE NOW ESPECIALLY WITH...