Yes, the 2008+ platform is fly by wire which is electronic. I tried it, left it on.. took it off, never noticed any differences. I just left it there now.. But I didn't feel anything change, nor did my gas mileage get better. But according to your sig, it looks like you have a car under 2008 era. Grounding the TB doesn't apply to that model.
2009 Focus SES Black Sedan Mods:
FSWerks CAI / F2 Header (non-fouler mod) custom flex / 2.5" FSwerks Stealth Stainless exhaust / FSWerks X3 tune / Autolite 104's / Steeda Strut Tower Bar / FRPP 1.5" drop / FSWerks FLS Bar / H&R 24mm RSB / MOOG endlinks / AEM wideband AFR gauge / 8000K HID Bi-xenon 55W / Tint / 17" Ford Racing Rally Wheels in Black / Coupe tails / Black grille
124whp/129wtq
FSWerks CAI / F2 Header (non-fouler mod) custom flex / 2.5" FSwerks Stealth Stainless exhaust / FSWerks X3 tune / Autolite 104's / Steeda Strut Tower Bar / FRPP 1.5" drop / FSWerks FLS Bar / H&R 24mm RSB / MOOG endlinks / AEM wideband AFR gauge / 8000K HID Bi-xenon 55W / Tint / 17" Ford Racing Rally Wheels in Black / Coupe tails / Black grille
124whp/129wtq