I have an 01 7.3 with a ts chip with custom tunes installed. Over the winter I lost my first 3 positions. Truck will run but has no response and very little power. Took chip out and cleaned. Can not see anything visibly wrong with the chip, wires , or pcm. Now I just lost my 4th position. Does any one know if these can just go bad.?Possible retune to fix? Or just have to start over with a new chip?