different ECM's or ECM differences?

[Jason Weir]

TBK wrote:

> >almighty, Diacom lists 3 different configurations for the 91 4.3
> (eng
> >code Z and year code M) they are as follows,
> >
> >1991 GM/Chevy Truck 4.3 V6
> TBI
> >1991 Truck Lt-Duty Emisn 4.3 V6
>
> Vortec or CPI

My 91 vortech was TBI what is the difference in ECMs?

--
Jason Weir
88 Wrangler - 258 Chevy TBI
Fayetteville, North Carolina
http://home.att.net/~jweir
mailto:jweir at worldnet.att.net