someone help
 

i juss had mt supra engine rebuilt it ran when praked tryed to start and no spark i think the guy who rebuilt spliced the wires going to the coils theres four wires out of the back of hte plug there is 4 wires one wire is spliced to go to evry coil while the other three go to seperate coils and i tested the woltage at each seperate plug and there is no more than 6 volts and the book says there suppose to be 12 somone help if u can

7mgte i assume?

if so make sure all wires have a good connection, you have good grounds
see if you can score another wiring loom for the coils (the part that plugs into the coils itself)
do a diagnostic to make sure the ecu hasn't picked up anything else