Injection computer internal fault!?

Recently bought a 197
Drive it home 120 miles
Then started running lumpy, which developed into a miss, then check injection and check esp lights came on.
Had it on a clip. Says injection computer internal fault. But my Renault clip guy says they never go wrong.
Changed plugs and coils
Car ran fine for the first 130ish miles of my ownership.

Any advice on where to go with this?