Ryan Bowen, Jake Gresh and Bryan Allbee beat Evan DeBrouwer three times on 18 shots in the second period.
Prince George potted a shorthanded goal by Ethan de Jong making it a 3-1 Chilliwack advantage after 40 minutes.
The Spruce Kings then cut the lead down to a single goal after Nolan Welsh lit the lamp with less than five minutes to go in the third but were unable to get the equalizer past Chiefs goaltender Daniel Chenard.
Chilliwack outshot the Spruce Kings 32-17.
The Spruce Kings return home to host game 5 on Thursday at 7 PM from the Rolling Mix Concrete Arena.
Game six will played on Saturday in Chilliwack.
Tickets are available at the Spruce Kings office from 9 a.m. to 5 p.m. starting on Wednesday.
If you can’t make it to the game, you can catch all the action with Spruce Kings home play-by-play man Brendan Pawliw on Hockey TV, Mixlr and 93.1 CFIS FM.