Ssangyong Actyon Sports Engine Problems

They can, and I am confident that they have had it on the computer, but they can only identify problems that exist when the car is put on the machine. Yours is intermittent, so might not be evident at the time the car is tested. It's most likely a faulty engine sensor that is only occasionally playing up.

If it does it consistently the dealer should be able to trace the cause quite easily and rectify the problem. If it doesn’t happen all the time it might be a little more difficult, but they should be able to check for a fault using their diagnostic equipment and hopefully find out what is going on.