Havent heard of this exact problem but this may be the issue. Most problems I've heard of are from over reving the engine by spinning your tires, than you will here a loud clunk and than nothing (trans unresponsive) like something broke. Car just went into limp mode.. Turn the car off than on and it will reset it and all AOK. If he raised the shift points (with predator) he will bounce off the rev limiter which will do this. He will need to either raise the RPM red line or return to original shift points.