4406bbls without the heat crossover blocked will overheat the coil,one of the bracket bolts goes in the head right next to the heat crossover, just my opinion that heat transfers through the bracket to the coil. I relocated a coil and control box to a location inside the nosecone of a Superbird that was a particular pain in the ass for stalling, fixed all the problems. I do not remember having all these problems with oem parts when these cars were new but who knows whats going on.