I had a 95% eff Trane furnace installed , now when the heat is on the outside pcv vents are spitting water and making a loud perculating noise . Is this normal?

Yes

Yes, some spitting and percolating is acceptable. However, if the plastic vent pipe isn't supported properly, it can get a bow in it, water can build up and actually block the vent. The heater will not work properly since the purge vent shows a back pressure build up and shuts down the heater.