ST170 Problem

[Menco]

Hey guys a recently brought a ST170 and a couple of faults have shown up with the car.

The car stalls when im rolling to a stop from time to time, and just completely cuts out. There are no problems with the idle or any misfiring at all it just dies. Im wondering however if this can be linked to the car surging a little bit at around 80 to 100km/hr. There is no change in rpm or speed i can just feel the car jerking slightly.

I have put some fuel cleaner into the latest tank of fuel so i will see if that helps, im thinking it could either be fuel or an ignition related problem.

Anyone had a similar issue or any advice?