Today, my Z started making snap, crackle, pop noise out of the exhaust. It's spewing a lot of exhaust as well. This is my first Z car and I'm a newbie when it comes to mechanics. All I know is that the car has the stock engine with twin carbs the previous owner installed and I'm not sure who's the manufacture or model. Also it won't idle in neutral as well. When I take my foot off the throttle it, it loses RPM and dies on me. I'm just wondering what's wrong and I want my Z purring again! Having such a beautiful car and having not working properly really bums me out. I hate having to hear my car sound like Rice Krispies! I like staring at it, but I'd love to drive it! I know the info I gave may not help, but I'm hoping one of you guys can help me out!