My 1978 280Z will start right up, and sounds great for about 2 minutes. The car will then quit, and will not restart for about 20 minutes. It will then restart, and run for about 2 minutes. The plugs seem to be fuel fouled. I have replaced the fuel pump, fuel filter, and plugs, and the problem is still the same. Not sure where to go from there! I am more a body man than a mechanic, but I am unable to find any mechanics in the SLC, Utah area that know anything about Z cars! Thanks!