'89 Corvette injector firing

[Dave Williams]

-> Does anyone know if the 1989 Corvette ECM changes from sequential to
-> batch fire at a specific rpm or injector pulse width?

 I haven't looked at the code, but I have a sizeable chunk of GM
documentation covering the 1990 (speed density) ECM.  There's nothing
about any sequential mode in that data.  Sequential was one of the
"features" of the 1991 ECM.