eprom in GM TBI unit ??

[bruce plecan]

OK, just something I ran into, on the 1227747, there is an
entry for a "spark adder", which seems to be a figure that
the ECM juggles in one hand while doing other things.  
Running 6d BTDC, and a 6d spark adder seems to work
out nicely.   Running less than 6 in the adder seems to
make the performance tempermental, and higher numbers
seem to make it lackluster.
  Someone probably has a more indepth view, but this
is again one of those things that just work for me.
  HTH   Bruce      nacelp at bright.net