Flash tuners are all the rage now. After the evaporation of ECM "chips" from the OEs' offerings ... basics of the tuning handled up front. As the program evolves, additional work can be made ...

But by the late 1980s, pre-programmed performance PROMs (Programmable Read Only Memory) and do-it-yourself software ... programming L98 engines. Weswood's Digispark system uses a 1994-95 LT1 PCM ...