Hi Mark,
Customer been away working, it was booked in for a mot and service, he phoned me when he was on his way saying it was only reving up to 2000rpm, and then started cutting out, cooling fan was running when it wouldn't start, if he disconnected and reconnected the battery it started!
I'm thinking that he has spiked the ecu with using the power pack. He's say's the vehicle was fine before he went away.
We managed to service and mot it in between the problems!
john