2010 TOYOTA 4RUNNER Power Train Problems

VEHICLE RANDOMLY AND SUDDENLY REVS ITSELF BOTH FROM A STOPPED POSITION AND WHILE DRIVING. WHEN DRIVING DOWNHILL AND I TAKE MY FOOT OFF THE GAS THE VEHICLE WILL CONTINUE TO REV ITSELF AROUND 3000 RPM THEN WHEN I START TO TRAVEL UPHILL IT WILL DOWN SHIFT TO ABOUT 1500 RPM. THIS SEEMS BACKWARDS. TAPPING BRAKES DOES NOT CAUSE IT TO DOWNSHIFT AS NEEDED, DOES NOT SEEM RIGHT TO APPLY BRAKES AND VEHICLE CONTINUES TO REV ITSELF HIGHER NOR DOES IT SEEM RIGHT TO TAKE FOOT COMPLETELY OFF THE GAS PEDAL AND THE VEHICLE CONTINUES TO REV UP. THE ONLY WAY TO GET IT TO IDLE IS TO APPLY PRESSURE TO THE GAS PEDAL AND SPEED UP WHICH IS DANGEROUS WHEN ALREADY GOING DOWNHILL. WHEN TRAVELLING IN A PARKING LOT IT REV ITSELF UP AND WILL JUMP FORWARD. FROM A STOPPED POSITION SUCH AS IN MY DRIVEWAY OR AT A STOPLIGHT...

PERIODICALLY SEEMED STIFF WHEN SHIFTING INTO DRIVE, THEN THE "4 LO" LIGHT STARTS FLASHING. I TRIED PUTTING THE RANGE SELECTOR IN 4 LO WHICH RESOLVED THE FLASHING LIGHT A FEW TIMES. TOOK THE VEHICLE TO TOYOTA AND THEY COULD FIND NOTHING WRONG BECAUSE THERE WERE NO CODES. THE LAST TIME I IT HAPPENED, IT STUCK IN 4 LO AND THE CHECK ENGINE LIGHT CAME ON. NOT A GOOD SITUATION TO BE FAR FROM HOME WITH A VEHICLE STUCK IN 4 LO. I TOOK IT TO A TRANSMISSION SPECIALIST. THEY COULD FIND NOTHING WRONG AND SAID THE CODE INDICATED A "RANGE PROBLEM" WITH THE TRANSMISSION AND THEY RESET THE CODES. NOW THE 4 LO LIGHT IS FLASHING AGAIN, TRAC OFF AND CHECK ENGINE LIGHTS ARE ON. GOING BACK TO TOYOTA. HOPE THEY CAN FIGURE OUT WHAT THE PROBLEM IS.

I WAS DRIVING INTO TOWN (APPROX. 12 MILES) AND SLOWED TO ABOUT 40 MPH AS I WAS APPROACHING A STOP LIGHT. I HAD TO APPLY ALL MY WEIGHT TO STOP THE VEHICLE. THE ENGINE DID NOT RETURN TO IDLE SPEED WHEN I WAS STOPPED. I SHIFTED TO NEUTRAL AND THE RPM INDICATED 1500 REVS. I KICKED THE GAS PEDAL AND THE ENGINE RETURNED TO NORMAL IDLE SPEED, 700 REVS. THE FLOOR MAT WAS NOWHERE NEAR THE PEDAL. I CAN NOT FIND ANY RECALLS FOR THIS VEHICLE. IS THERE A FIX FOR THIS PROBLEM? *TR