P0353 Ignition Coil C Primary/Secondary Circuit Malfunction

Does it mean i have a faulty coil pack?

 

It can be either coil , wiring or the ecu raising this fault code , check wiring first unless you have a coil at hand

 

I do have an coil at hand so think I will test to swap. The other day the car started running poor. And I checked for fault codes and it showed missfire on cyllinder 6. So I swapped the spark plugs today. And now it runs even worse and showes the fault code about the coil. just pushed over all the cables now and started again, and it showes one more fault code. wich is P0352 Ignition Coil B Primary/Secondary Circuit Malfunction.
Could this have anything to do with my resent installment of bluefin chip?

 

it could have but seeing you have swapped plugs and the fault has either moved or got worse , might either be a plug or the coil wiring at fault

 

just swapped the coil now and it still is shit, with the two error codes. I know this coil is working. Going to check the plug leads are set correct, 99% sure they are but never know. Last thing I know I can do then is to swap the plug leads.

 

Sorter The problem. All The leads were attached corect but probably not good enough. Pushed and twisted on all og them and now it runs perfect. My old sparkplugs was really bad. Some of them had less than half the gap they should have and had started melting.
But now it's all good thanks jonathanJ for The help.