SEBACOQUI was talking about having a gas smell in his thread about a missing fpr vacuum hose. Maybe the gas you're smelling is due to a vacuum hose that's come off or is simply missing now too? If it's not a missing vacuum hose, maybe it's a bad clamp or hose that is split? A hose with a split would be more likely to leak when it's cold and not as pliable to help it form into a seal.