I have a car that runs great hot, well after 2-5 minutes . It will stall when braking any time before that. A 2000 mustang GT and I'm thinking the hydro boost brakes create just enough draw on the power steering pump to stall the engine. I don't believe this car has a switch to add rpm for that, though some fords did. It is around 13.5 or so cold , so is that just to lean while the engine is cold or should I raise the rpms till it doesn't stall. Which the rpm is around 12-1300 and climbs a bit as the engine warms until it switches tables, warms up and then idles to 1000 rpm. Never stalls after that. I am running 91 pure gasoline at the moment. And by cold start I'm talking a 70 degree day first start and drive away.