DB7 vantage fuse 8 blowing
 

Hi everyone newbie from spain.
I have a problem with my db7 -it keeps on blowing fuse 8 -for bank 2 coil packs-
I have changed all 6 coil packs as one was showing a short but still every now and again the fuse blows and then it will fire and then shut off.change the fuse and off it runs!
Anyone had this experience that could shed some light on this problem
thanks
Mike