i was running a haltech e8 in my old ute
as for the idle up and cold start some tuners like them on for a cold start tune, if you dont want one like i didnt i removed mine and just made a plate
as for the coils, i was running 4 ls1 coils which i mounted on a peice of booker rod and that i made some mounts for up under the dash(be sure they clear the wiper arms)i wasnt running a heater so there was plenty of room, it also alloowed my to run the leads straight out the firewall and you couldnt see them at all for a nice clean look