So, basicaly 1/2 the coil does not work. And you said you changed the coil.
1. check that the new coil is aclually good. Get a voltmitter/amiter and probe the coil. it should be like 1&4/(+)/2&3 or combination of the 3. in short there has to be same resistence between a pair of connectors on the coil. Check the coil resistence too inside.
2. if 1 checks out, you will have to trace the wires all way back to the ECU and cheking for continuety.
3. if 2 checks out, check the connectors for dirt, oxydaxation, etc...
4. if 3 check out then its the ECU

good luck.
PS, did you get the exact same P/N coil as was originally?