I have a problem related to the ISC 6 polewhen the car is being warmed up and driven in traffice...so that 1 st gear...stop....2st gear stop...the engine goes from idle to 2000 rpm.....and I will have to turn off the engine to reset the car again to normal......few minutes later it will redo it..what can be the problem coming from? already changed the isc stepper motor with a new one.....same problem persisting