Just took the ECU out of the car to remove the aftermarket chip fitted. Plugged the old OEM chip back into the chip socket soldered on the board by the chipper and put it back in the car. Car now turns over but won't fire. Gonna try puttin the uprated chip back in and see if it runs again. Any ideas what I could have done wrong???? Chip is in the right way, might it have got damaged somehow while out of the car? Any pointers in the right direction very much appreciated.