Just bought a 2008 Duramx lmm.. Put about 5000 km on it now. The truck has a sct tuner and is fully deleted. The other day when coming up to a red light the truck suddenly stalled. The truck will easily refire and go again. A message comes on the dash engine power reduced when it is going to stall as well. The stall is very intermittent and only happens when coming to a stop. Any trouble shooting tips would be appreciated.