What people don't get, is these computer systems weren't really wanted by the auto manufactures. It's the government standards and requirements for emissions and fleet average mpg that forced the invention of the CCC. In fact the C4 too. C4 was even before CCC. C4 was Computer Controlled Catalytic Converter. This is why AIR came about, aka Smog Pump when it actually Injects Air into the engine instead of pumps it out. The mpg and emissions requirements is why our vehicles in the late 70's and into the 80's were de nutted. Compression dropped, power droppped, speed limits dropped, gears became taller like into 3.08's 2.73 and 2.56's in pick ups. Also what forced the Overdrive transmissions.
Of course now, technology has finally caught up, so we get our horsepower back along with mpg and cleaner emissions. Hp finally started coming back in the right direction with Vortec in 96.
If people took the time to learn these systems, they're not bad other than there is more parts to go wrong and more parts to diagnose.
The LE9 305 with ESC was most common in these years because that was GM's answer to the fleet average mpg and emissions requirements.
