My 77 280z runs and idles great, until you step into it and put it under a load, than it bogs down and almost dies. Would the issue likely be the AFM? Car sat for about eight years without being ran. Cleaned fuel tank, new fuel pump, new filters, plugs, etc. Possible vacuum leaks? Any advice would be appreciated. Since the car was only sitting, is there any reason why the AFM should need to be re-set? No one has messed with it, and it was all good eight years ago.