Where's the ground?

[Byas U Nambisan <Byas_U_Nambisan@domain.elided>]

I'm going through all possible causes on the cold idling problem that i have on 
my 80 (FI) Fiat spider.  I'm checking air leaks, dirty injectors, fuerl 
pressure, SP wires, aux air reg, AFM, ECU, and bad grounds.  I'd like to 
eliminate the coolant temp sensor as a cause.  The sensor itself is within 
specs, but maybe the ground is bad?  Where is the ground on this?
Byas