Regarding the ignition coil, what is the fix for this? on 2002 Jaguar S-Type

I have had all eight of them replaced plus thousands in repairs made to no avail. The engine still misses and sometimes completely loses power. The car is essentially unusable like this. It has been an ongoing battle for two years. Another mechanic is convinced the computer is the problem. Is that likely before I spend more money?

Asked by for the 2002 Jaguar S-Type
definate possibility