Eec.
If you have an old piggyback tuner on the EEC it could be the tuner thats NG. If you change the EEC it will need to be the same alpha numeric code. Like mine is c0s, the three digit code is on the EEC. On the early cars the EEC does not effect the trans. My EEC is for an auto trans car, I converted the car to a stick. You might want to look into a new tuner before you chuck the EEC, the new Moates Quarter Horse ROCKS!!