The computer. Ahhh yes, the thing that went out on me when I got too bogged down in water at one time. It's been said to me that Ford probably mounted it a little too low in the engine compartment in my year model. Correct me if I'm wrong, it controls spark timing, fuel curve, and some other things, right? Replacing with another chip might help with gas mileage, horsepower, and one or two other things, depending on the chip, am I right?