Horrible idle - to the point that it can't be driven. The engine doesn't appear to be burning any of the fuel that's being injected, or the injectors are staying open. Its hard to describe, but bad. At high rpm levels, it sounds fine, but has horrible loping. At lower rpms, its barely able to stay running, and often cuts off. Spits out too much black smoke, and almost immediately smells of unburnt fuel once started. In general, runs like the timing is horribly off - but from the looks of the timing marks on the front crank markers, its right on.