Got a Pinto or any kind of low horsepower car with air condition? You know, when you turn the air on you lose 1/2 your power. Going up a hill is a real chore. Easy fix. Just install a vacuum switch on the air compressor that cut off the compressor when the engine produces little or no vacuum, like going up a hill. These switch's can be bought at large part stores like NAPA , Speedway Racing or a large auto air condition shop. You could also cut out the alternator at the same time with the same switch.