During recent snow storm in Ok, my son flipped his '95 4Runner on county road. When I got to him, it was on its roof. Managed to pull it over and towed back to the house. Removed plugs and cranked the engine to remove any fluids that had filled cylinders. Installed new spark plugs and replaced wires while we were at it. Managed to get it running, but it runs real rough, almost like a couple of cylinders aren't fully working. Removed wires from plug and they are getting spark. Also drinking fuel like no tomorrow. Any suggestions on where to start on this problem? Thanks.