When my engine is cold I have no brakes assist, it’s bloody scary. Feels like it’s almost impossible to get the car to pull up but I don’t believe it’s anything to do with the brake booster, I have a FZJ80 Aussie spec and the same day the brakes stopped working properly the engine also started running poorly. It was after a 4 hour drive, 300km drive non stop. The day after that drive, I hopped in the car and it wouldn’t idle,if I try to drive, it feels like I’m towing a invisible caravan and smells insanely rich. it would stall and shake and brakes wouldn’t work. When the car gets halfway on the temp gauge it begins to idle but still rough and brakes begin to work again. If I’m cruising at low rpm on a freeway or something, the car begins to shake like it’s vigorously misfiring. Doesn’t throw any codes. Could this be a vacuum leak? I can’t see how it would affect my brakes? All feedback appreciated. I’m almost ready to take it to a mechanic if I can’t find the issue soon, and I’m meant to go away for a trip in 2 weeks