About to do the old fuel upgrade. Fuel pump. Hot wire. Filter, injector. Regulator, TT Chip. Hoping this will solve or help. The car start runs decent for 10 seconds. Then misses, chokes and sputters eventually stalling. I have spark, plugs are black and seems to be running fat based on smell and smoke. All Scanmaster points seem fine but I feel it’s not running long enough to get good reading. Any thoughts before I dig into this tomorro. 87 GN, supposed to be about 40k miles however has been sitting for a number of years.