Code P1320 not fixed by changing bad ignition coils, what else?

Question

Check engine light not going off even after bad ignition coils changed. Car shakes upon start up.

-Matthew

Answer 1

you might have more than 1 bad coil, unless you replaced all of them. 

check the other coils 

also check the ECM relay 

if none of those are the problem the wiring to the coils has to be checked