I'm worried it may be something more serious like an intake manifold gasket leak. Car smells like burnt antifreeze when it's acting up and looks like it's leaking just a small amount of something right under the engine bay(was sitting outside in the driveway all night so couldn't really tell what it was). Is carb cleaner safe to use because I've heard several people say they have seen first hand cars igniting with the cleaner and causing an engine fire.