My 98 K2500 loses all power assist to both brakes and steering at once. This only happens ocasionally when coming off of freeway, foot on brakes and engine ideling. It does not die and will pick it up again as soon as I can get over my panic attempt to steer and stop. Blip the throttle and all is well again for who knows how long. Happens every month or so, just about the time I start to get comfortable with it again. Any ideas? Thanks.