Dart keeps stalling after running for 15 or so minutes. I’ve replaced the ecu, coil, ballast resistor, fuel pump and carb. Thinking it might be vapor lock, I even put a heat sleeve on fuel line - still no good. Car runs super strong for first ten to fifteen minutes. After it’s run warm for a few minutes I can feel it begin to stumble when just cruising 30-40 mph. Pedal will cut in and out for a few miles then normally (or maybe coincidentally) when I let off gas to slow down or come to stop engine cuts out completely. Not sure what else to check at this point. Any idea what would cause a stall like this after motor runs at temp for awhile? I should also mention that the engine temp is good. I have an electric fan that keeps coolant temp around 180-185. Could it be a wiring/grounding issue that shows up when engine bay gets warm? Getting a little frustrated because it runs so good when cold. Any thought would be greatly appreciated.