Quote "I’ve heard many people state their engine didn’t run properly in traffic on hot summer days when pulling air from the engine compartment. Installing a system that pulls air from outside the hot engine bay fixed their problem."
That sounds more like Vapor Lock
Getting underhood temp down is the ticket when sitting in traffic. Sure the cool air intake is some what of a help so is insulating fuel line , electric fuel pump back at tank. I'm not that big on ceramic coated headers, but they say it helps. Remember when we use to put the washers between the hood and the hinges for a gap at the back of the hood to let that hot air out? Keeping the fuel cool is the name of the game especially with ethanol when sitting in traffic on a hot day maybe try a Cool Can or look into Fuel injection kits....JMO