Hello, I have a 1988 Carbureted Prelude S. After several minutes of driving (around 12 miles) at high speed (about 75mph) the car will begin to hesitate(more like a buck) and gradually lose power until it stalls. When it happens the bucking starts out minor, then gets progressive worse. Once you shut it down it will run on for a few seconds. I have a spare carburetor and put it on, same problem. I've checked the fuel pump also, it is also fine. So, I'm thinking that its some sort of spark or timing issue. Does anyone know what could be causing this or something like this?