2009 Toyota 4Runner VEHICLE SPEED CONTROL,ENGINE

UPON ACCELERATION, THE VEHICLE HESITATES FOR 2-3 SECONDS. THIS HAPPENS ON STARTING OFF, DRIVING DOWN THE ROAD, PULLING INTO TRAFFIC. I HAVE HAD IT TO THE DEALER 15-20 TIMES AND THEY CAN'T FIND THE CAUSE. THEY SAID IT HAD TO FAIL FOR AT LEAST 5 SECONDS FOR IT TO REGISTER ON THE COMPUTER MODULE. IT NEVER LASTS MORE THAN 2-3 SECONDS AND, I CONSIDER IT 'VERY DANGEROUS'. DATES ABOVE ARE APPX. IT DOES IT EVERY DAY. *TR